this question of Fast food restuarants like MCdonald's and Burger King, what can cause that to happen of where people in line behind the person get their meals first. I do get annoyed when and if that happens.

what is the longest wait you have had in a Burger King or McDonald's when it is not crowded and there is only one or two or three people ahead of you. what is the worst service you have had : explain your case.