Please forgive me if you've heard this one before, but it was new to me. This is courtesy of my husband, and his naughty office mates who clearly don't have enough to do today...!!!
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 asshole is doing while you're having an orgasm?"
She replied, "Probably deer hunting with his buddies."
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"It is our choices that show what we truly are, far more than our abilities"
(Dumbledore to Harry Potter)