A gynecologist became bored w/his profession, so he decides that he wants to become a mechanic. He enrolls in a mechanic class, works hard at it, studies hard at it, and when it comes time for the Final Exam - he feels as if he is ready.
When the teacher of the class gives back the grades on the Final to the students, the ex-gynecologist sees that he has scored a "150". Believing that there must be some mistake, he asks the teacher about the grade.
The teacher says, "Well, you completely took apart the engine, which is worth 50 points, you completely reassembled the engine, which is worth 50 points - and you managed to do all of this through the muffler - good job !!"