Chili's staffer mistakes chemical for sugar & mixes it with margaritas, people suffer burns

A staffer at Chili's restaurant in North Carolina mistook a cleaning chemical for sugar and mixed it with margaritas. Three customers immediately experienced discomfort, suffering chemical burns in and around their mouths. The dangerous mix-up happened when an employee brought granulated degreaser inside the store, and poured it into an unlabelled container, which the bartender mistook for sugar.