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."
Yo Mama - Committing Suicide
Yo mama so stupid, she tried to commit suicide by jumping out a basement window.
Q: What do you call a stupid Chinese prostitute?
A: Wun Dum Ho.
Yo Mama - Locked In
Yo mama so stupid she got locked in a bathroom and wet her pants!
Yo Mama - Copycat
Yo mama so stupid that when she looked in the mirror, she said stop copying me!