How do you handle it when you're lining up for a queue, or in line, and someone else maneuvers themselves in front of you?
For example, let's say you're at the supermarket. Let's say you arrive at the cashier, and there is a line. Shortly after you arrive, someone else does. But, because there might be a small gap between you and the "official position" of you being in line, the newcomer then moves into the space in front of you, even though it ought to be obvious, that you're in line, and were there first.