Seat belt

"Airline hostesses show you how to use a seat belt in case you haven’t been in a car since 1956."

This person is trying to give advice to the person who even doesn't know the meaning of A. You can say that a person who can not afford to have fan at home, is getting tips on how to operate air-condition at home. So when someone is doing such a silly thing, you can instantly punch this joke.
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