Time machines sound cool in theory. I mean, it all worked out for Marty McFly in those Back to the Future movies. But what if your future self was kind of a jerk who just wanted to travel back in time to give you a total mindfuck. It happened to Paul Gale and it could happen to YOU.
Remember kids, there are a hundred of Balfons and if you don't want to be alone you had better do whatever crazy shit that time traveler tells you to.