Short & sweet!

A gynecologist had become fed up with malpractice insurance and HMO
paperwork and was burned out. Hoping to try another career where
skillful hands would be beneficial, he decided to become a mechanic.
He went to the local technical college, signed up for classes,
attended diligently, and learned all he could. When the time for the
practical exam approached, the gynecologist prepared carefully for
weeks and completed the exam with tremendous skill.
When the results came back, he was surprised to find that he had
obtained a score of 150%. Fearing an error, he called the instructor,
saying, "I don't want to appear ungrateful for such an outstanding
result, but I wonder if there is an error in the grade."

The instructor said, "During the exam, you took the engine apart
perfectly, which was worth 50% of the total mark. "You put the
engine back together again perfectly, which is also worth 50% of the
mark."

After a pause, the instructor added, "I gave you an extra 50% because
you did it all through the muffler, which I've never seen done in my
entire life".