I have friends who will say, "Oh you gotta come and see our show." And the first thing I say is, "Is it sketch or improv?" I'll go in a minute to see a sketch show. I love sketch; it's my favorite form. But if it's all improv, they're either very good and it's annoying how good they are and it makes you feel bad, or they're not too good then you're sweating for them. And you don't want to sweat for them, see actors repeating each other's lines.
Fred WillardIt's more fun in a way to do ensemble scenes, where you know your background, you know the scene, but you can't prepare because someone else is going to say something that is going to lead you off
Fred Willard