"Doing Her In" joke
A man confided to his doctor that he had grown tired of his wife and wished there was a way of doing her in so he could have some good years left to himself.
"Make love to her every single day for a year," the doctor advised. "She'll never make it!"
About a year later, the doctor stopped by the man's house. He found the man sitting on the porch, looking thin and frail. The doctor could see the wife out back splitting wood, looking very tanned and robust.
"Hello, Harry, you're looking good," said the doctor uneasily, "and Jenny certainly is the picture of health."
"Yeah, but little does she know," hissed Harry with an evil grin, "that tomorrow she dies!"
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