Avenue Q, the Broadway sensation now playing at the Ahmanson Theatre, simply put, is Sesame Street and The Muppets for adults. Actually, it's any go-lucky humpty-dory family/neighborhood TV sitcom with overly crude humor. It's a tight production with abrupt segues, hints of metatheatrical jabs and extremely catchy tunes. Everything's very un-PC, but that's okay, cause a puppet said it, right? They're just telling it like it is, as they see it, no qualms about......