In Super Mario World, if you make the right series of moves with the right game objects, you can cause the game to execute arbitrary code. A particularly delightful use of this feature was recently shown by Masterjun, a tool-assisted speedrun enthusiast. He unveiled the speedrun to the world using an unmodified game cartridge and a Super Nintendo Entertainment System with eight controllers connected through a multitap system at the Awesome Games Done Quick 2014 event. Hack A Day explains the technique. Masterjun explains it in more detail.
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