i really prefer not to watch movies when i'm trippin, but i did see a hilarious movie called death at a funeral when i was trippin balls. it's pretty much about this family's funeral for their high society dad and all the chaos ensues. for instance, the niece takes her fiance to the funeral. he has a headache so she gives him what she thinks are valium from her brother's medicine bottle. turns out it's lsd. pretty much for the entire duration of the movie, he's tripping, causing everything to go wrong at this funeral. it's hilarious to watch while tripping!
stoned, i'd say THE GINGERDEAD MAN. awesomely horrible. apparently they made a second one. may have to rent that sometime...haha