I still get a kick out of The Adventures of Buckaroo Banzai Across the 8th Dimension. Just watching the end credits — which you may only do if you've already seen the whole movie — is enough to make me smile. It may be a so-called cult classic, but it puts to shame every bigger-budget blockbuster I can think of.
Kevin Smith is a big fan, too. But I admit, it's not to everyone's taste.
My prediction: somebody, one day, will write a book about that watermelon.