Ricky Gervais loved the "realism" while acting with the Muppets.
The 52-year-old star hits the big screen in the 'Muppets Most Wanted' alongside children's favourites Kermit the Frog, Miss Piggy, and the rest of the famous clan.
Gervais enjoyed working with them because unlike other films which require computer-generated imagery, like the 'Night In The Museum', the characters in this movie are visible while filming.
Talking at film's press conference at London's Soho Hotel today (25.03.14), Kermit said: "It's tough to choose someone fictional [to work with] because we're the only ones who aren't computer generated, you see, they're not really there."
Constantine - who plays the villain - added: "You couldn't see them at a press conference."
Gervais explained: "I've done 'Night In The Museum', just done three, Ben Stiller is in it a lot and he's in the scenes when all the animals come alive, but they're not really there. So, he spends six weeks running around talking to a tennis ball on a stick whereas with this, you're acting, you're acting with these guys! It's brilliant fun, but it also makes a difference with the timing and the realism and the affection for it. I mean it's real."
'Muppets Most Wanted', which is directed by James Bobin, follows the Muppets on tour in Europe where they unwillingly find themselves mixed in criminal behaviour.

James Rebhorn wrote his own obituary before he died.
The 'Homeland' actor passed away on Friday (21.03.14) aged 65 following a lengthy battle with skin cancer, and wrote a touching piece in which he paid tribute to his late parents, wife Becky and their daughters Hannah and Emma at some point during his final days.
The full piece was first posted on the website for his church, St. Paul Lutheran Church in Jersey City, New Jersey and praised his parents for giving him "faith and wisely [encouraging] him to stay in touch with God."
The obituary went on to describe James' wife and their children as the "centre of his being".
He wrote: "They anchored his life and gave him the freedom to live it. Without them, always at the centre of his being, his life would have been little more than a vapour.
"His children made him immensely proud. Their dedication to improving our species and making the world a better place gave him hope for the future. They deal with grief differently, and they should each manage it as they see fit. He hopes, however, that they will grieve his passing only as long as necessary."
And the 'Scent of a Woman' star concluded the writing to thank those who had helped with his career.
He closed: "Jim was fortunate enough to earn his living doing what he loved. He was a professional actor. His unions were always there for him, and he will remain forever grateful for the benefits he gained as a result of the union struggle. Without his exceptional teachers and the representation of the best agents in the business, he wouldn't have had much of a career. He was a lucky man in every way."

Rumer Willis wants to open a nightclub.
The 'House Bunny' star inherited "many millions of dollars" from her famous parents Bruce Willis and Demi Moore when she turned 25 last year, and is now looking for an investment opportunity in Hollywood.
A source told RadarOnline.com: "Rumer came into many millions of dollars last August on her 25th birthday and got full control of the trust Bruce and Demi set up for her.
"She wants to use it to invest in a hot business and has been telling friends she wants to own a nightclub. She's begun scouting existing Hollywood spots that could use her 'touch'."
However, the insider doesn't think Rumer will get the backing from her parents - who divorced in 2000 and have two other daughters, Scout, 22, and Tallulah, 20, together - for her new venture as their own foray into the hospitality industry was unsuccessful.
The source added: "Bruce and Demi had a bad experience in the club and restaurant business when they backed the once-famous Planet Hollywood chain that eventually flopped, so it's doubtful that they'll like the direction Rumer wants to take her investments.
"But Rumer has largely lost the acting bug and now that she's financially independent, she's going to try a lot of different things that don't involve her parents' careers."

Chris Hemsworth and Elsa Pataky have named their twins Tristan and Sasha.
The couple - who already have daughter India Rose, 22 months - welcomed the boys into the world earlier this month and now the Spanish actress has revealed what they have called their two sons.
Posting a picture of the twins' feet on her Instagram page, she wrote in Spanish: "You are home! Tristan and Sasha came to this world on March 18 just after the full moon. Complete happiness."
Elsa has also advised new parents to treasure every minute with their babies.
Writing in a blog post for Spain's Glamour magazine, she said: "Enjoy every second with your baby because it is the most wonderful thing of the world."
Proud father Chris, 30, previously gushed about family life and admitted he is happiest when he is with his wife and daughter.
He said: "Being a father is certainly a task. But the best one that I could ever ask for. Being home, being with the family, that's what it's about ... It makes me much more relaxed with work, because I have something that is far more important to me now."
The actor married Elsa, 37, in 2010 after a whirlwind romance.

Lauren Conrad has had to tone down her "girlie" home since her fiancé moved in.
The former 'Hills' star is a fan of overly feminine and vintage styles of decor, but admits her partner William Tell doesn't share her tastes.
She said: "If it was up to me, my home would just be over-the-top girlie and vintage but I share my home with a gentleman now."
And the 28-year-old beauty is trying to curb her habit of working from her bed.
Speaking to the new issue of Allure magazine, she said: "Your bed is for sleep and sex."
The fashion designer also revealed the key to her laid-back style.
She explained: "Take any trend you want and relax it. That's how California does it. If it's silk button-up shirts that are in, you probably don't button them all the way, and you cuff a sleeve, you know what I mean?
"It's almost like how your outfit looks at the end of the day."
Lauren is a big fan of hair extensions and wouldn't be without them to boost her locks.
She said: "I can't remember the last time I didn't have extensions.
"Extensions are great. And they've come so far in the last few years."

Britain's Prince Harry has taken Cressia Bonas skiing in Kazakhstan. The 29-year-old royal has shunned the exclusive Swiss Alps - which is a popular skiing destination for the royal family - for a getaway in the former Soviet state in central Asia. H...

Cressida Bonas' brother is worried about her safety.
Jacobi Anstruther-Gough-Calthorpe, whose sister is dating Prince Harry, has revealed he is concerned about public intrusion into the 25-year-old beauty's life as a result of her growing relationship with the royal.
He told The Times newspaper: "They're my private family, she's a private person. As the media machine builds around my sister, I'd rather the media machine didn't build around my sister.
"I don't see it ever really affecting my life. My only worry is making sure she is safe and she is OK and she is happy. I don't really think about it all except in the sense of her own safety."
Harry, 29, and Cressida are currently enjoying a skiing trip in Kazakhstan and she is set to join him in co-hosting a royal dinner at St James's Palace later this week.
The couple have been seen out-and-about together numerous times of late, leading to speculation that another royal wedding could soon be on the cards.
Cressida accompanied Harry to the We Day charity event in London earlier this month and they were also spotted canoodling at a rugby match at Twickenham Stadium last moth.

Prince George's new nanny could have been a nun.
Friends of Maria Teresa Turrion Borrallo, the Spanish nanny recently hired to look after the third-in-line to the throne, tipped her to become a nun when she was younger because of her lack of interest in boys and her puritan lifestyle.
One pal told the Daily Express newspaper: "We all thought she would end up becoming a nun because she was such a different girl to the rest.
"She hardly had any friends and she didn't show any interest in boys."
Family hairdresser Antonio Robledo told Spain's El Mundo: "She is very special and shy and I've never known her to have had a boyfriend. Above all she's a good person."
Maria Teresa's brother Luis chose a life in service to god three years ago when he was ordained as a deacon, but his sister followed her passion for childcare.
Luis has since moved into working for a hospital, aiding mentally ill patients.
The royal nanny's mother Maria Teresa - who still lives in her hometown of Palencia, Spain - recently gushed over her daughter's new job.
She said: "I am very proud of my daughter, that's all I can say. On the personal front, and professionally, my daughter couldn't be better."

The Rolling Stones will resume their world tour in Israel this summer after postponing dates following the death of Sir Mick Jagger's girlfriend L'Wren Scott.
The 'Brown Sugar' hitmakers have confirmed they will perform in Tel Aviv, after moving dates in Australia and New Zealand to October, as part of their '14 ON FIRE' tour, after L'Wren committed suicide at her New York apartment on March 17.
Promoter Shuki Weiss announced today (25.03.14) that the Rolling Stones will be gracing the stage at Park Hayarkon in Tel Aviv on June 4.
In a statement, he said: "This is a historic and very meaningful visit. In these days when we hear calls for boycotts from around the world, it's not taken for granted that a band of this magnitude will come to Israel."
Shuki has worked with the likes of Madonna and Depeche Mode in the past but claims persuading the Stones to sign up for the show has been his biggest challenge.
He admitted: "The longest negotiation I ever conducted is coming to an end."
The band - also made up of Charlie Watts, Ronnie Wood and Keith Richards - were recently confirmed for Denmark's Roskilde Festival which takes place from June 29 to July 6.
Meanwhile, preparations are being made for L'Wren's funeral, which will take place in Los Angeles in coming days after her body was moved to the Hollywood Forever Funeral Home and Cemetery.

Andrea Bocelli has married his long-term partner Veronica Berti. The Italian opera singer - who was blinded at the age of 12 - tied the knot with Veronica before friends and family in an intimate wedding ceremony at the Sanctuary of Montenero in Livor...

Ricky Wilson says he'll return to 'The Voice' - if Kylie Minogue does.
The pint-sized popstar is set to leave the BBC One singing competition after just one series because of her upcoming 'Kiss Me Once' tour, but the Kaiser Chiefs frontman says he signed up for the show to work with Kylie and would be bitterly disappointed if she didn't return.
He told The Sun newspaper: "We have known each other for such a long time.
"She is one of the reasons why I did it and one of the reasons why I'd stay. People like the show -- they like the chemistry."
BBC bosses are desperately trying to lure Kylie, 45, back for the next series of 'The Voice' after she threw plans into disarray by announcing her intention to leave the show.
The blind auditions for the fourth series would begin filming in November, but Kylie will be touring at the time.
She said: "I'm touring later this year and the timings wouldn't work.
"We started filming in November last year and I'm on tour in September, October and November this year ... I have loved doing the show although there have been parts that have been really emotional."
But a BBC spokesperson stressed the corporation is willing to accommodate Kylie's schedule in order to secure her services.
They said: "We are aware of Kylie's commitments and are looking to accommodate them."

Bruce Jones has warned Michael Le Vell to clean up his act.
The former 'Coronation Street' actor was axed from his role as Les Battersby in 2007 due to his alcohol problems and he is worried his co-star and pal, who was recently suspended for cocaine use, could end up losing it all like him.
The Kevin Webster actor has had a tumultuous 18 months that saw him face trial for alleged sex assault crimes. He was cleared of all charges in September and returned to the ITV soap recently, but has now been dropped again after admitting to Class A drug use.
Bruce told the Daily Mirror newspaper: "I went to see Michael before his trial and wished him all the best and was looking out for him.
"I don't want what happened to me to happen to Michael.
"I ended up on the streets, completely broke with nowhere to go - it was an awful time. I know he can beat his demons though, he's stronger than me and a great actor."
Bruce, 61, has now turned his life around and has urged Michael, 49, to do the same by throwing himself into his work.
He added: "He's got to not be scared of life and get on with things. He needs to go and talk it out, he mustn't bottle it up."