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 ass 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 just use your other hand to write."