One of the first episodes of the Beavis and Butt-head revival in the early '10s was about weight gain. They saw Morgan Spurlock on an awards show and deduced that he got rich, famous, and dated a hot chick (who he was dating before anyway) by stuffing himself with food and they could, too. They stuff themselves for a month and gain an impressive amount of weight.
I certainly wouldn't consider either character sexy, but I did enjoy the progression of their weight gain from guts hanging out under their T-shirts to morbidly obese and almost immobile.
4 years