It's rude to threaten a former partner.
Bob just broke up with his long-time girlfriend and moved out of her apartment when he realizes he left his favorite hat there.
Bob wants to retrieve his beloved hat.
Bob calls his ex-girlfriend and poilitely asks if he can come by later to get the hat.
Bob threatens his ex-girlfriend with physical harm if she doesn't return the hat to him.
Bob's ex-girlfriend agrees, and he is happy to get back his favorite hat.
Bob's ex-girlfriend calls the cops on him over his threats, and he is arrested.