Food

One of the most annoying things about living in a college dormitory
was the frequent disappearance of food from its refrigerator.
At my wit's end, I put two shiny apples in the fridge
and placed a sign beside them:
"One of these has been poisoned."
Later I showed my roommate what I had done.
The apples were still there, but next to my sign was a new one:
"Now both are."

The funny story above is taken from Campus Comedy.
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