Lets say you are in a queue in a post office or in a bank and there are 4 or 5 people in front of you and you notice someone is hanging around and keeps moving to the front of the queue then moves away, then moves back again and then moves in again but this time they push in front of the person at the front, should that person object to that or just keep quiet,or should you object to them or to a member of staff, who doesn't want to get involved in case the other person turns violent or pulls out a knife or gun?
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