Q: Did you hear the one about the roof?
A: Never mind, it's over your head.
Yo Mama - Easter
Yo mama so stupid, her parents let her hide her own Easter eggs.
Yo Mama - Meow Mix
Yo mama so stupid, she thought Meow Mix was a rap CD for cats.
Little Johnny - Stupid
A new teacher tries to make use of her psychology courses. The first day of class, she starts by saying, "Everyone who thinks they're stupid, stand up!" After a few seconds, Little Johnny stands up. The teacher asks, "Do you think you're stupid, Johnny?" "No, ma'am, but I hate to see you standing there all by yourself."
Q: Why can't you tell blondes knock knock jokes?
A: Because they leave to go answer the door.