 "A Stash from the Past" (originally telecast October 5, 1993) is a wise, waggish and exceedingly daring episode from a sitcom renowned for its unflinching audacity. When Roseanne finds a bag of pot in one of the kids  rooms, she s angry---and worried about how Dan (John Goodman) is going to react. Of course, he goes ballistic, until he realizes the stuff is a 20-year old relic of his and Roseanne s youth, inevitably, they roll a joint for old times  sake, and before you can say "like, wow," Dan, Roseanne and her sister, Jackie (Laurie Metcalf), are adrift in a Cheech-and-Chong time warp. At first, they have fun sneaking around like they did in the  70s, hoping not to get busted by their children, but then adult realities set in like a bad trip.