While waiting for Homer's shift to end, Marge finds a quarter on the casino floor and uses it to play a slot machine. When she wins, she immediately becomes addicted to gambling. Bart is too young to gamble at Burns' Casino, so he starts his own casino in his tree house, tricking Robert Goulet into performing there. Burns grows even richer from his casino, but his appearance and mental state deteriorate, making him resemble Howard Hughes. He develops paranoia and a profound fear of microscopic germs, urinating in jars and wearing tissue boxes instead of shoes on his feet.