Leigh Whannell quotes:

Horror films are very functional like comedies. The main thing with a comedy, the big question is "is it funny?" And with horror the question is "is it scary?"

The problem with acting is that there's really no control. You're at the behest of others. Everyone else decides if you did a good job and you have to wait for other people's permission to work as an actor.

What I love about writing is that you don't need anyone's permission to do it. You can just get up in the morning, grab a pad and pen and start writing. With acting you're really beholden to everyone else.

I love watching audiences scream. I imagine it's the same joy that a director feels who has made a comedy when he or she is sitting at the back of a theater listening to the audience laugh. That sound of laughter is so sweet to a comedy director and that's exactly how a horror film feels when you hear the audience scream.