Dennis Hopper and Peter Fonda are far-out hippies on choppers who set out to find America—and sell a lot of cocaine—in the classic Easy Rider (1969). Along the way they meet rednecks and turn on a then unknown Jack Nicholson to the wonders of weed. This low-budget sleeper came from nowhere to become a huge box-office hit and single-handedly spawned the biker genre. Its heavy existential ending may bum your high, but scenes like Sabrina Scharf skinny-dipping with Hopper in the commune or a pre-"Mickey" Toni Basil romping naked through Mardi Gras on acid will keep your freak flag flying. Karen Black was also in that Mardi Gras sequence but kept her clothes on.