"I'll make his bed slant so his bed will collapse when he is making love," said the carpenter.
"I'll hot wire his mattress so that he'll feel immence heat while making love," said the electrician.
"Those are good ideas," said the dentist. "But I'm not going to tell you what I've got planned."
The next day the salesman comes into the diner. He says "Real funny. I enjoyed the bed collapsing, and the hot mattress was a neat trick, but I'm going to kill the bastard who put novocaine in the Vaseline."