I would love to have the power to cause abdominal cramps.
Say you're driving down the highway and some numbnut is tailgating you. You try to get him to back off, but he doesn't. You use your not-so-super power to give him a weird clenching feeling in his gut. He has to pull over. He recovers, but not for an hour or two.
Say some idiot, like, pretend, my neighbour, decides to use their leaf blower to chase imaginary leaves off their driveway. Hey, presto! Stomach cramps force them to turn the damned thing off and go and have a little nap until they pass.
I'd never use my power for evil. Unless there was a long line-up and I was in a hurry. Then I'd be tempted.