A middle aged gynecologist was going through a mid life crisis and decided to change his line of work. He decided to leave gynecology and become an auto mechanic. After 1 year in Trade School, he took his final practical exam which involved taking an automobile engine apart and reassembling it.
He the was anxiously awaiting the results. Finally he gets the letter which tells him that his grade was 150 %.  He thought this was a little strange and called the teacher. He asked how could he get 150%?  The response was that he perfectly took the engine apart and this was worth 50%. He also perfectly reassembled the engine which was worth another 50%. He then said yes but that is only 100%. The teacher said Yes but I added on another 50% since you did it through the tailpipe.