You should always make sure your friends are doing OK.
Sharon is at a large party in a mansion with a few girlfriends, and one of them seems pretty drunk.
Sharon wants to enjoy the party till the end.
Sharon calls a cab for her drunk friend, sends her home and goes back to partying.
Sharon figures her friend is an adult and will take care of herself.
Sharon's drunk friend spends a safe and peaceful night in her own bed.
Sharon's drunk friend is taken advantage of by a group of guys in a remote corner of the mansion.