Farts (F-)=(Common)
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Farts: Being able to release noxious gases that can make a person's eyes water would be useful for clearing a room. There are only a few places on the human body where such things can escape from. The butt is the most natural choice.
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Eating Anything: (F+)=(Common)
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Eating Anything: Having a cast-iron stomach is a pretty much useless power that some people do indeed have. I wonder what kind of nutrition the body would get from consuming batteries. Also, passing those batteries would be no picnic (especially D batteries).
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