After 20 years as a gynecologist, the doctor decides to retire because he's bored wants to try something new.
He's always liked hot rods so he decides to go to school to become an auto mechanic.
When the time comes for his final exam, he completes the task and asks, "How did I do?"
The instructor says, "Fantastic, you scored 150%!
The retired doctor replies, "150%, how did I do that?"
The instructor tells him:
" I gave you 50% because you disassembled the engine perfectly"
"Then, I gave you 50% because you put it all back together exactly right, the engine ran, and you had no parts left over"
"And finally, I gave you an additional 50% because you did it all through the muffler!"