It's bad to pick a fight with someone.
Tom is with his friends in a bar when a drunk stranger starts yelling at him and pushing him around.
Tom wants the guy to leave him alone.
Tom keeps his cool and calms the guy down by talking to him.
Tom pushes the guy back and punches him in the face.
The guy feels remorse at having been aggressive and realizes he should think before he acts.
The guy's nose is broken, he retreats and leaves Tom alone.