You and Tim are close friends, and you know that you can count on him whenever you need to.
Today was such a day: you've been in a bar on your own, as some creep got a little too close, and the situation escalated.
Long story short: you hit him and got thrown out. You then called Tim and asked him to drive you home, which brings you to now.
"I owe you something." You apologise.
He grumbles something inaudible and opens the passenger door for you. "Get in before I change my mind."