It's rude for cashiers to question customers about their purchases.
Dave who is a cashier is ringing up Sam and notices that Sam is buying tampons.
Dave wants to ask Sam a question about the tampons.
Dave asks Sam if he realizes that the tampons are two for one, and he can go grab another box if he wants to.
Dave asks Sam why he would need tampons since he is not a woman and demands Sam explains his purchase.
Sam is grateful that Dave pointed out he's missing a bargain and runs back to get another box.
Sam is flabbergasted that he's being asked about the tampons and insulted and embarrassed that everyone can hear the conversation.