It's rude to crowd in line.
Jimmy wants goes to the opening night of a movie and see the line for tickets is long.
Jimmy wants to get on the line for tickets.
Jimmy gets on the line and stays an arms length from the people in front of him.
Jimmy gets on the line and walks into the people in front of him.
Jimmy and the people in front of him stand in the line undisturbed.
The people in front of Jimmy start a fight with him for invading their personal space.