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