"Can you play the Seinfeld theme?"

You know, that question that makes most bass players roll their eyes. What would be the equivalent for some other instruments? Something you could fire back at another musician. For saxophone, I would think "Baker Street," and for trumpet, "Spanish Flea." Any other good suggestions?

Edit: gosh, I thought I came up with a fun game. I didn't realize people would get so caught up on the keyboard part.