When you decided to go out for a night on the town, the last thing you were planning to do was drink. However, while you were out, you ran into an old friend, and throughout the night you both had a little too much to drink.
When it was time to leave, it was already 4 a.m., and the roads seemed deserted. You decided to try to make it home, since it was only a few blocks away. Needless to say, that didn't work out in your favor, and you went off the road as a result of the combination of being slightly impaired and exhausted from a night out with no sleep.