One of the worst customer interactions I've ever had was when I worked at a Chinese food place. A guy placing his order told me that his pregnant wife was allergic to sesame, and if she had any of it, she'd break out in hives. He also mentioned that this was her favorite restaurant. I noted the allergy on his order, but he kept calling the store, reminding us that there was to be no sesame in the meals. I reassured him that I had told the kitchen there was a sesame allergy for this order, and t…