A gynecologist decided to quit, and become a car mechanic. He took a mechanics' course, and did the mechanics' union exam, and received the grade 105. The authorities were very mad at the tester for such an unusual grade, and inquired about it. The tester explained, "He's a really good mechanic. I asked him to fill oil, and he did. I asked him to put in new filters, and he did. I asked him to clean the spark-plugs, and he did." "So why didn't you grade him a 100, why 105?" "Cause he did it all through the exhaust pipe."