Avenue Q, and off Broadway musical that I've been hearing good things about for a decade.
I hated it. It was schlocky -- the music was boring and embarrassing, the thin plot had nothing compelling it, and the use of puppets for some of the characters just seemed annoying to me. Worse, it was offensive in a blithely cheerful way -- actors and puppets singing and dancing about racism, among other things. My friend and I walked out at intermission.