usually nothing. the bottom pin of a US outlet is meant to connect to the case of an appliance. that way, if something inside it breaks and accidentally connects the case to the live wires inside, the electricity will go out out that bottom pin instead of through, say, *you*
having that pin exposed wouldn’t do anything unless there was a fault. then that pin would be live and just sort of…sticking out into space? pressed up against a piece of flammable plastic like the the side of the socket?
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