The Big Bang Theory

They have loads of this type of parody Off-Broadway (all 100% unofficial, of course).

I saw the Saved By The Bell one a couple of years ago, which was reasonably funny, but you have to know the show really well to follow the references.

Off-Broadway (and Off-Off-Broadway) is the type of thing that makes our London fringe theatres like the Union look like they're delivering big budget productions in front of huge audiences.