You shouldn't drink and drive.
Mark is at the bar with friends, having some beers and watching the game on the big TV.
Once the game is over, Mark wants to go home.
Mark decides to call a cab instead of trying to drive home.
Mark decides to drive himself home, because he's only had a few of beers and doesn't feel drunk.
Mark arrives home safely, and picks up his car the next morning.
Mark's reaction time is affected by the alcohol he's had, and he loses control of the car crashes into his house.