A substitute teacher walks into the classroom and sees a message on the blackboard.

It reads, "Jimmy Poole has got the biggest tool in the whole damn school!"

She yells, "Whose Jimmy Poole?"

A kid in the back stands up and says, "I'm Jimmy Poole."

"Well, Jimmy, your staying after school!"

The very next day when the substitute teacher walks in, she looks up at the blackboard and sees the words, "It pays to advertise."