I like acting for myself as a director. I act and I know that I'll have a chance to have some say in what gets used and that I'll be able to give myself enough takes and be on the same page as myself about how the scene should play.
When you innovate, you've got to be prepared for everyone telling you you're nuts.
Also, from a technical point of view, as you're standing in front of a microphone all day, it's quite a good idea that I should play a laid back sort of character because if he was too frenetic, I'd be exhausted by lunch!