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In supermarkets I always keep a respectable distance from the person being served. Certainly no closer than the end of the conveyer. I bloody hate it when people don’t do the same for me. I’ve had other customers so close when I’m just about to pay I’ve almost asked them if we are going halves on the bill and others that practically push you out the way when I’ve taken 2 seconds to put my card and receipt in my wallet.
People who queue so close up to you that they might as well be on top of you particularly when they echelon so they're in your peripheral vision.
The queue won't move any faster and I'm not going to usher you ahead....