My favorite Rodney Dangerfield joke:
You know, I just got this new dog. He's really an amazing dog. Really, really smart. As a matter of fact, this dog can read. Yeah, yeah, it's incredible, I know. Well, he picked up this book the other day about how pets and their owners start to look alike after awhile ... he committed suicide.
A guy walks into a bar, says, I just flew in from Chicago and boy is this joke tired!