Loading groceries onto the conveyer belt in Tesco just now and a man comes up behind me breathing down my neck, throws down a divider and starts putting all the stuff from his basket on the belt. I then pushed the divider back and passive aggressively loaded my groceries on taking up as much space as possible, slamming my potatoes down and making him jump. He then folded his arms and leant on the belt whilst giving me a long hard stare.
Yes, he could probably see that my small trolleyful would not fill up the belt but isn't it good manners to wait for the person in front to unload first?