You sorta have to see the move 'the mist' to understand it, but basically, theres all these wired ass creatures out in the fog, and its a really painfull death to die by them, so they get in the car, and get pretty far, then run out of gass. Then they decide to commit suicide because they don't want to die a painful death. However, there are five of them (Two elderly, one child, and a father and mother). The father decides he's going to be the one to stay a live, and he'll kill everyone else in the car so they don't have to suffer a horrible death. He kills all of them and hes left alive. -.- Watch =D
I've seen that, when I watched that I laughed my ass off so hard. It's not that he decided he'd be the last to live, it's that they were comitting suicide and he ran out of bullets at himself, and then they show everyone (including his son and wife) dead, and then the army killing the mist creatures or whatever. Life sucks for that guy lmao.