Joke of the Week #18

"All right, class," the gym teacher says to her fifth-grade class. "Now, I'd like you all to lie on your backs and kick your feet in the air like you're riding a bicycle."

One by one the students all drop to the floor and start rapidly kicking their legs-save for one boy who's slowly moving one leg in the air while keeping the other leg on the floor.

The gym teacher walks up to him. "Say, what's wrong?"

"Well, you see," the boy answers. "I've got a flat."