Waking Life
Harold and Kumar
Easy Rider
Requiem for a Dream
Ray
Training Day
Dazed and Confused

Oh, and it isn't a movie, but the TV show LOST is unbelievable when you're high. You have to start watching from the first episode though, because the show plays like 1 long movie. Nothing is resolved at the end of an episode.

That's all I got off the top of my head
Elias Grodin 23 Reviewed by Elias Grodin 23 on . Good Movies For When Your High SNL Best Of Will Ferrell. Game over best movie for when your high ever, watching the cowbell skit with Christopher Walken made me laugh so hard I almost died from lack of oxygen intake. Rating: 5