Comeback of the Year !!

 A college teacher reminds her class of tomorrow's final  exam. "Now class, I won't tolerate any excuses for you  not being here 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 raised 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."