Joke Title: Cyanide Watermelons
There was a farmer who grew watermelons. He was doing pretty
well, but he was disturbed by some local kids who would sneak
into his watermelon patch at night and eat his watermelons.
After some careful thought, he came up with a clever idea
that he thought would scare the kids away for sure.

He made up a sign and posted it in the field. The next day,
the kids show up and they saw the sign which read: "Warning!
One of the watermelons in this field has been injected with

The kids ran off, made up their own sign and posted it next
to the farmer's sign. When the farmer returned, he surveyed
the field. He noticed that no watermelons are missing, but
the sign next to his read: "Now there are two!