A gynaecologist is getting bored with his job and decides he wants a new career. He sees an advert in the paper for careers in the automotive industry, so he decides he's going back to college to train as a mechanic. Anyway, it comes round to final exam time, he is pretty worried about the practical exam as he doesn't think he's going to pass, but puts on a brave face and does his best. The next week the results are out, he opens the envelope to find he got 150 for the practical exam! Delighted but confused he calls up his lecturer to query the result. "How can I get one hundred and FIFTY percent?" he asks.

"Well" says the lecturer, "You dissasembled the engine fine, nothing wrong with that at all, so I gave you 50 for that part, then you put the engine back together again with no mistakes, also excellent, so I gave you another 50" "So what about the extra 50?" asks the ex-gynaecologist.

"Well I gave you THAT" says the lecturer, "for doing it all through the tailpipe of the car!"