It's rude to fight with other people.
Joey is waiting in a long line at a grocery store, and is stuck behind a man who is taking a long time to pay.
Joey wants the man to finish quickly so Joey can get checked out.
Joey offers to help the man finish up checking out.
Joey yells at the man to hurry up, and shoves him out of the way when he continues to dawdle.
The man appreciates Joey offering to help and wishes him a good day.
The man is very embarrassed and tells Joey he's going to contact the police.