It's rude to rebuff somebody after getting a gift
It's almost Sandra's birthday and Sandra has asked her parents for an expensive black phone, but receives a white one instead.
Sandra wants to get a different phone.
Sandra thanks her parents for the phone, then finds someone online who wants to trade phones.
Sandra starts crying once she sees the gift and tells her parents that they don't love her, then demands the other phone.
Sandra and the other person get the phone that they really wanted and her parents aren't disturbed.
Sandra's parents get offended at her lack of gratefulness and take the phone away.