I've only been to few, but because they're usually pretty similar, I stopped going. Included were Hare Hare Yukai in all of them. An Avenue Q song 2. A Who's Line is it Anyway - like skit with people who (could be funny with friends) but on stage, lack a sense of humor so turned to bad internet meme's. And one cleverly done Scott Pilgrim scene.
Those were the ones that stuck out to me.