You should tell your friend if they're making a mistake
Jim is drunk at Jack's house party and wants to go home, so he decides to drive himself.
Jack wants to react to Jim's decision.
Jack tells Jim that would be a mistake and convinces him to sleep in his guest room.
Jack tells Jim to drive safe and wishes him farewell.
Jim wakes up sober and is able to drive himself home with no issue.
Jim is pulled over by a cop and arrested for driving under the influence.