I'm betting it's this episode.
http://www.imdb.com/title/tt0642410/
Thanks to a college grant of $25,000, Bud is ready to leave home and start the good life at college, until Al and Peggy discover the money. Being the selfish petty criminals they are, they grant the money for themselves, and go on a wild spending spree in just one day that leaves Bud with zero.