Harold and Maude. Apparently it's a '70's "cult classic." Which makes some sense, especially since Cat Stevens did all the music.
Despite the fact that Cat Stevens has done some good music, if you haven't seen that movie, I don't suggest bothering. Unless, of course, you happen to like straaaaange.
Cheesy, I can often enjoy (The Russians are Coming, anyone?) Silly, I can take rather well--Dumb and Dumber was funny, as was Shanghai Noon. Bizarre, however... I've never quite gotten used to that genre.
If you liked Arsenic and Old Lace, then Harold and Maude, its somewhat poignant cousin, is the movie for you.
Call me a wimp, but I think I'll stick with Surf Ninjas.