My husband went through a fast food drive through and ordered two burgers with mustard only. It was repeated back: two burgers, mustard, ketchup and mayonnaise. No mustard only. This went on several times and finally he was so frustrated he said he is deadly allergic to mayonnaise and ketchup and he will die if they put that on, mustard only. Please do not kill me. OK, two burgers with mayonnaise and ketchup, only. To this day she probably has no idea why he left.