A while ago, David posted about a neat YouTube clip of mashups of Coen brothers movies - it's amazing how well they sort of fuse with each other! - that left me wanting more (and strangely ... wanting waffles. Must have waffles forthwith).
Anyhoo, I just ran across a post on David's blog Always Watching on his interview with the maker, Paul Proulx of Sly-Fi, with many more fantastic mashed up clips of movies of Stanley Kubrick, Tim Burton, Quentin Tarantino, Wes Anderson, Martin Scorsese and so on.
Check it out, it's excellent: http://www.alwayswatching.org/features/amazing-movie-montages-paul-proulx