Following an argument about who was most important to the ship, a captain and his chief
engineer decided to swap places to find out. After a few hours, the captain emerged from the engine room covered in oil and confronted the engineer on the bridge.
"Chief," he yelled, wildly waving a spanner, "you'll have to go down below. I can't make
her go."
"Of course you can't," replied the engineer. "She's aground."
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