It's frowned upon to fight.
Dave is shopping with his wife Ann when a stranger, Bill shouts that his wife Ann is fat.
Dave wants to reprimand Bill for insulting his wife.
Dave shouts back at Bill that he must be a classless peasant to say such things to strangers.
Dave runs over to Bill and proceeds to start punching Bill in the face repeatedly until Bill falls down.
Ann is happy that her husband is witty enough to quickly come back with a retort and defend her honor in a non violent manner.
Ann is horrified that her husband is being such a violent caveman and screams in terror as she watches him brawl.