other hand to write

A teacher was wrapping up class, and started talking about tomorrow's final exam. He said there would be no excuses for not showing up tomorrow, barring a dire medical condition or an immediate family member's death. One smart ***, male student said, "What about extreme sexual exhaustion?", and the whole classroom burst into laughter.

After the laughter had subsided, the teacher glared at the student, and said, "Not an excuse, you can use your other hand to write."