An elderly couple had just celebrated their 50th anniversary.
They were sitting on the porch swing reminiscing about their
lives when the old man looked at his bride and back-handed her.
She looked at him and asked, “What was that for?” He said that
it was for 50 years of bad sex. She walked into the house and
returned with a rolling pin and whacked him so hard that he
fell out of the swing. He looked up and asked, “What was that
for?” She said, “For knowing the difference.”