Friday will always be my favorite. "I know you don't smoke weed, I know this. But I'ma get you high today. Cuz it's Friday, you ain't got no job, and you ain't got shit to do!"
Requiem for a Dream is false advertising for a stoner movie IMO. I watched it for the first time super baked and that shit was incredibly intense and I what the fuck'd out loud at certain parts that normally would have just made me cringe. Great movie, just idk about the genre label in this case. Grandma's Boy is my current fav, love it.
Fear and Loathing in Las Vegas - Visually the film is amazing and both Johnny Depp and Benizio Del Toro are true to the book.