You gotta commit.
You've gotta go out there and improvise and you've gotta be completely unafraid to die. You've got to be able to take a chance to die.
And you have to die lots. You have to die all the time.
You're goin' out there with just a whisper of an idea.
The fear will make you clench up. That's the fear of dying.
When you start and the first few lines don't grab and people are going like, "What's this? I'm not laughing and I'm not interested," then you just put your arms out like this and open way up and that allows your stuff to go out.
Otherwise it's just stuck inside you.
- Bill Murray on Improv
Another bit that I really enjoyed and will most certainly co-opt:
SR: "Everything happens for a reason."
BM: That drives me nuts. I want to give them five on rye when I hear that. "Everything happens for a reason."
SR: Five on rye?
BM: Five on rye. A knuckle sandwich.