"If I had five coconuts and I gave " joke
If I had five coconuts and I gave you three, how many would I have left? I don't know. Why not? In our school we do all our arithmetic in apples and oranges.
Your Mamma's so fat, when she went bungee jumping, she broke the bridge!
Your momma is so fat when she fell in the grand canyon she got stuck half way down.
You mamma is soo fat she sat on a rainbow and skittles popped out!
Your daddy is so bald that when he puts on a turtle-neck he looks like a broken condom!