It is bad to shove people
Charles is standing in a long line at the grocery store, and wants to ask the cashier if he can run back to grab milk without losing his place.
Charles wants to try to be heard by the clerk.
Charles asks the man in front of him if he can please get through to ask a question to the clerk.
Charles pushes the man in front of him trying to get to where the cashier can hear him.
The man is happy to oblige, and Charles is able to get a response to his question.
The man that Charles pushes gets angry, and punches him in the face.