A carpenter, an electrician, and a dentist had a mutual friend who was
getting married, and in keeping with the custom, each was determined to
play a practical joke on the newlyweds. The electrician decided to wire
up the marriage bed so that when the two bodies touched, they got a
shock. The carpenter planned to saw partly through the bed frame so that
it would collapse when the shocked newlyweds jumped apart. And as the
wedding approached, the dentist was still scratching his head and trying
to come up with something.
After the honeymoon the new husband confronted his three frinds. "I
didn't mind too much when we got zapped," he told them, "and we both got
a good laugh when the bed fell down. But who the hell put Novocain in
the Vaseline?"