One of my lead characters has to do community service at a grocery store. She has magical powers that will allow her to escape easily, but they are suppressed by a high-tech wrist brace. The plot requires that she come up with a clever way to smash the brace and deactivate it, allowing her to use her powers again. The thing is, I can't think of anything within a grocery store powerful enough to do any real smashing. I need help! Should I come up with another way to deactivate it, or is there just something I missed?