A man calls a refrigerator repair service. "My refrigerator isn't working."
"What kind is it?"
"It's a small one."
"Electric, gas or propane?"
"Ah! Then the problem is most likely vapor lock. You don't need a service call, just turn the refrigerator upside down for a few minutes to allow the lock to clear. Then put it back and all should be well."
Second call, a few minutes later. "The least you could have done is to tell me to empty the fridge first!"
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