A professor at the University of Minnesota was giving a lecture on 'Involuntary Muscular Contractions' to his first year medical students.

Realizing this was not the most riveting subject, the professor decided to lighten the mood slightly. He pointed to a young woman in the front row and said, 'Do you know what your a$$hole is doing while you're having an orgasm?'

She replied, 'Probably deer hunting with his buddies.'

It took 45 minutes to restore order in the classroom....