Create a superpower that is useful, but only in certain situations and/or on a very small scale.
For example: I have the power to make sparks when I snap my fingers, as though they were a flint and steel.
Gus Sorola has the power to corrode metal over several years simply by touching it.
Impress and underwhelm me, flood.
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The power to refill. You're eating Doritos and you run out. Refill. That annoying person no one likes. Refill their bladder so they have to go to the bathroom.