Originally Posted by Ed Palmer
A Professor was giving a lecture on "Involuntary Muscular
Contractions" to his first year medical students.
Realizing that 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 azzhole is doing while you're
having an orgasm?"
She replied, "Probably deer hunting with his buddies."
The professor laughed so hard he could not continue with the class.
You can't tell which way the train is going by looking at the tracks