If you check your ego at the door when it comes to comedy, you've got a pretty good shot at making a great movie that you can commit yourself to, you can jump off the proverbial cliff with, and have a great time, and the audiences respond to that.
“People always tell me I'm nothing like my character. Well, hopefully not! He's a character who's very defined. He was purposefully written by Jo Rowling as very one-dimensional in the first few books, because you're supposed to hate him.”