A professor at the University of The Thames Valley 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 mature student in the front row and said, 'Do you know what your arse hole is doing while you're having an orgasm?'

She replied, 'probably pheasant shooting with his friends.'

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