The teacher had given the class an assignment. He stresses the importance of this particular assignment, and that no excuses will be accepted except illness (with a medical excuse) or a death in the immediate family (with a note from that member).

A smart-[censored] student pipes up: "What about extreme sexual exhaustion, sir?"

The class breaks up laughing, and when they settle down the teacher responds with: "Well, I guess you'll have to learn to write with your other hand."

Now that's funny