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The joke:

Two farmers bought a truckload of watermelons, paying five dollars apiece for them. Then they drove to the market and sold all their watermelons for four dollars each. After counting their money at the end of the day, they realized that they’d ended up with less money than they’d started with.

“See!” said the one farmer to the other. “I told you we shoulda got a bigger truck.”

The rest (actual information).