'Lucky' is for laughs and there's really nothing funny that I'm doing on 'Dexter.' I think more than anything both comment on the fact that anybody is capable of anything. Just because they are the shy guy in the corner doesn't mean that they are a harmless little bunny.

It's funny the hardest thing to do is to make something look like it's fast loose and improvised and get somebody to laugh.

During the Great Depression when people laughed their worries disappeared. Audiences loved these funny men. I decided to become one.

Comedy is so subjective. You could be in a room with 400 people laughing at a joke and you could just not think it's funny. You're just sitting there like 'Am I in the twilight zone? Why is everyone laughing?' It's such a personal thing. People have such a personal visceral response to comedy.

There's a darkness under 'The Hangover' because ultimately there's a missing person and it's not really that funny. There's a sort of darkness under it that I love and still people are laughing as hard if not harder than they did in 'Old School.'

Laughter is involuntary. If it's funny you laugh.

I think if they put a laugh track on 'Intervention ' it would be funny.

Sometimes laughing isn't the best judge of what's funny 'cause I think there's a lot of things that are really funny that don't make you laugh that don't make you physically audibly make a noise but is something that is much more powerful than that.

And I think that being able to make people laugh and write a book that's funny makes the information go down a lot easier and it makes it a lot more fun to read easier to understand and often stronger. So there's all kinds of advantages to it.

Billy Crystal knows how to make people laugh. He's got 30 years on stage... there's no telling him what's funny.