The plot of this movie is that Will Hunting is a genius but he doesn't want to do genius things. Everyone he talks to tells him to go away because you can't be a genius in Boston. Apparently the only way to be a genius is to leave a city full of world-renown universities. Eventually everyone nags him enough and he gets in his car and drives off to genius land. I think the song that plays as he drives off is "Don't Stop Thinking About Tomorrow", but it's been a while since I've seen it so I might be remembering that wrong.