"The wrinkled old crone got on the train" joke
The wrinkled old crone got on the train and, exhausted, retired to her bed, which was the upper berth in a sleeper car.
Shortly after falling asleep, the woman was awakened by loud snoring from the lower berth. She tried wrapping the blankets around her head, but to no avail; finally she kicked her heels on the mattress. Moments later a man's voice came from below.
"Save your energy," he said. "I got a good look at you when you came on board."
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