"Yessiree, I ain't scared of no goats," smiles the 49-year-old, Canadian-born actor.
"Or words to that effect. I think the rule is there for a good reason, but both children and animals have become much more professional down through the years.
"Besides, I think that's where my humour really comes to life -- when I'm allowed to be silly. And both children and animals allow you to be very silly indeed."
"Doesn't it?" he nods. "I was definitely kind of hooked from very early on with this movie. The book is pretty old, and it's stood the test of time. That was definitely another part of the appeal -- for a kid's story to last over 70 years, it's got to be special.
"Of course, it helps that Mr Popper's Penguin has been part of the reading curriculum in elementary schools in America all this time, too. That way, kids have got to like it."
"Yeah, I think you could call it loose," says Carrey. "We wanted to change a few elements of the story, and push the comedy of the situation that little bit higher. It's just too sweet a concept not to push it a little. A guy in New York whose apartment suddenly becomes a winter wonderland because he's got all these penguins living with him -- how could I resist that?"
"They're smart, those penguins, but not quite smart enough to do entire dance routines with me. We tried to get the penguin from Happy Feet involved, but he was too busy on his sequel. And, frankly, we couldn't afford him -- he's too big a star now."
And there can only be one star in a Jim Carrey film.
"That's right!" Carrey shouts. "I don't want anyone who might be funnier, smarter, or more beautiful than I, appearing in any of my films. It's a policy that has made me the superstar that I am today."
Sad and lonely?
"Exactly."
"It would be very, very easy to go crazy, always looking at the numbers for your movies," says Carrey. "There's such an exact science when it comes to market research and test screenings, and yet, anyone in Hollywood will tell you that you really never truly know what's going to happen with a movie.
"So, you know, best not to think about all that too much, and just get on with making movies that you get a kick out of. I'm lucky in that I don't have to sweat it, I don't have to go out begging for work. Of course, I want the work that I do commit to to have some merit, to have a degree of fun involved. And fun involves being challenged a little too."
"We're all getting older," finishes Carrey, "but, the big question is, are we getting wiser? Here's hoping. In the meantime, I think having some fun along the way is probably the best path to take. It's important to go out with a smile on your face . . ."
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