Lecture
 

A professor at Memorial University of Newfoundland was giving a lecture on 'Involuntary Muscular Contractions' to his first year medical students. Realizing this was not the most riveting of subjects, the professor decided to lighten the mood a little and get everyone's attention at the same time.

He pointed to a young woman in the front row and said, 'Do you know what your asshole is doing when you're having an orgasm?'

She replied, 'Probably playing golf with his buddies.'

It took 15 minutes to restore order in the classroom!