So this fat guy makes a promise to himself to lose some weight, and sees an ad that guarantees he'll lose 50 pounds in two weeks or DOUBLE his money back! He calls the number, gives out his credit card info to pay $500 and eagerly awaits the results. The next day, he hears a knock at the door. He finds a gorgeous young lady in a tank top and running shorts with a sign around her neck that says "If you can catch me, you can fuck me!" So he chases her around 5 or 8 blocks before he has his way with her. On his return home, he finds that he'd lost 6 pounds. The next day, there's another knock at the door. He opens it to find an even sexier girl with the same sign around her neck. This time it takes him about two hours to catch her, but he'd lost another 10 pounds. "Hey, this is great!" he says to himself "I ought to lose 50 pounds in two weeks easy! I can hardly wait for tomorrow!" On the third day, he's standing at the door waiting for the knock. When it comes, he finds a huge weightlifter dude, who says "You know the drill! Start runnin'!"