A high-school English teacher reminded her class of the final exam that would be given the following day. She told the class that there would be no excuse for not showing up, except for serious injury or illness, or a death in the student's immediate family. A smart-ass jock in the back of the room asked, "What about extreme sexual exhaustion?" The entire class did its best to stifle their laughter and snickering.
When silence was restored, the teacher smiled sympathetically at the student, shook her head, and sweetly said, "Not an excuse. You can write with your other hand."