Grass (1999)

While it’s unlikely to change US drug policy, Ron Mann’s entertaining documentary chronicling the bizarre 100-year history of laws against the use of marijuana may prompt outrage, discussion and a perverse sense of nostalgia. Actor and pro-hemp activist Woody Harrelson narrates this unapologetic advocacy film, an often hilarious retrospective of past anti-drug campaigns, propaganda films and publicity crusades, which often linked marijuana use to insanity, sexual promiscuity, homicide and permanent brain damage.