Dennis Hopper has a credit in an unreleased drama.
After staging a "suicide attempt" (really more of a daredevil act) in a coffin using 17 sticks of dynamite during an "art happening" at the Rice University Media Center (filmed by professor and documentary filmmaker Brian Huberman), and later disappearing into the Mexican desert during a particularly extravagant bender, Hopper entered a drug rehabilitation program in 1983
Hopper plays an aging hippie prankster in the 1990 comedy Flashback, fleeing in a Furthur-like old bus to the tune of Steppenwolf's "Born to Be Wild"

