Cameron: I didn't know anything about that at first, but it's hilarious.
Which do you prefer - animation or acting live?
Mike: I like to be employed! On the first Shrek I had a hard time with it. I'm used to having make-up, running round, using a lot of physical energy.
But then I thought: 'This is fun.' I enjoyed thinking about stuff, and I grew to like it.
Were there less perks than on a live set?
Cameron: We only had to show up for a couple of hours over a few years! (We think she's joking.)
What do your kids think about you being in Shrek?
Eddie: Even if I wasn't in it, my kids would love Shrek!
Shrek messes around with fairy tales. Do you think that's OK?
Cameron: Absolutely. Those fairy tales have run out. This is a modern fairytale which is allowing people to see where we are right now. It allows kids to know you have to love and accept yourself before others. No Prince Charming is going to give you that.
There are rumours of a Shrek 3 and 4. Would you do them?
Eddie: Absolutely. I look forward to it. I love these characters. I love this movie. I'd do 10 of them!
You can catch the full Shrek interviews on Newsround Showbiz on Sunday at 9.50am and 3.50pm on the CBBC channel.