A high school English teacher reminds her class of tomorrow's final exam.

"Now class, I won't tolerate any excuses for you not being there tomorrow. I
might consider a nuclear attack or a serious personal injury or illness, or
a death in your immediate family - but that's it, no other excuses
whatsoever!" A smart-ass guy in the back of the room raises his hand and
asks, "What would you say if tomorrow I said I was suffering from complete
and utter sexual exhaustion?"

The entire class does its best to stifle their laughter and snickering. When
silence is restored, the teacher smiles sympathetically at the student,
shakes her head, and sweetly says, "Well, I guess you'd have to write the
exam with your other hand."