The teacher assigned a task to the class, emphasizing its importance. He stated that no excuses would be accepted except for illness (with a medical certificate) or a death in the immediate family (with a note from that member).
A cheeky student chimed in, "What about extreme sexual exhaustion, sir?"
The class erupted in laughter. When they quieted down, the teacher replied, "Well, I guess you'll have to learn to write with your other hand."