"Knock Knock - Cosby" joke

Your Mamma's so fat, when she went bungee jumping, she broke the bridge!

Once Chuck Norris had a boner.
Their were no survivors

Q: What's the worst trick you can do to your blind brother?
A: Leave the plunger in the toilet

Ya mama so fat the only thing stopping her from going to Jenny Craig is the door.

You mamma is soo fat she sat on a rainbow and skittles popped out!