I conceived an Adventure Time + Attack the Block mash-up — Finn as Moses, Jake as a monster — and my sweep of the Internet for any existing Adventure Time + Attack the Block mash-ups morphed into a hunt for the oddest Adventure Time mash-ups on the Internet.
Among the numerous candidates (see: The Avengers, Batman, Bill and Ted's Excellent Adventure, Calvin and Hobbes, Dawn of the Dead, Doctor Who, Donkey Kong, Futurama, The Good, the Bad, and the Ugly, The Green Lantern, The Legend of Zelda, My Neighbour Totoro, Mother 3, Pokémon, Psycho, Pulp Fiction, Samurai Jack, Scott Pilgrim vs. the World, Sin City, Skyrim, Star Wars, Super Mario Bros. 2, Tyler, the Creator, The Venture Bros., Wilfred), I submit:
Adventure Time + King of the Hill
Adventure Time + Superjail!
Adventure Time + Shadows of the Damned
Adventure Time + Sigur Rós' Takk…
Adventure Time + Home Improvement