It had to be done - Cheech & Chong, those movies are the best that have ever been made for people who are high, bar none...
Other than that, Pineapple Express, Hot Tub Time Machine, Land of the Lost, Half Baked, Clerks 1 & 2 and so many more :P
Quotes from Cheech & Chong:
- "Mexican Americans / love education / so they go to night school / and take Spanish / and get a B"
- hey man how am i drivin?... i think we're parked man.
- you just ate the most acid i ever seen anyone eat in my entire life / hey man i never had no acid before man / i hope you're not busy for about a month man