An English teacher reminds her students of the written test in her class the next day:  "Now, I don't want anyone to miss this important final's exam!"  I will not tolerate any excuse whatsoever for your absence---unless of course you had to go to the hospital because of a serious injury or someone died in your immediate family."  Just after she spoke, a wise ass in the back of the class exclaims:  "Well, what if I were to tell you that I didn't show up for the test because I experienced complete and utter sexual exhaustion?"  The students in the class try to suppress their snickers and muffled laughter.  The teacher looks sympathetically towards the young man, smiles slyly and states:  "Well, that excuse won't work because you can always use the other hand."