Involuntary Contractions

A professor at the University of Wisconsin 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 spice up his lecture.

He pointed to a young woman in the front row and asked, "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.

Hat tip: Sandy B of Traveling Bells