Going to the nail salon is supposed to be a relaxing experience, one of warm towels, hand rubs, and remote-controlled massage chairs. But as anyone who’s ever walked away from a “pampering spa day” with bloody cuticles or scalded skin from a too-hot foot bath (or worse) can already attest, not every salon is a good place to unwind. For one U.K. woman, a trip to an unfamiliar spot ended not with a shiny new manicure and a positive Yelp review, but with a finished result that took her request for