The internet is full of remixes of movies and trailers these days: Wes Anderson's Forrest Gump, The Shining as a romantic comedy, Toy Story 2 mashed up with Requiem for a Dream, Toy Story meets The Wire, and so on. But before all of that, from 1987, perhaps the first mashup of its kind, Apocalypse Pooh:
Todd Graham made this short film with VCRs and film nerds passed around copies on VHS tapes. (via @johankugelberg)