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A Gift of Watermelons - The Elder Scrolls IV: Oblivion
Oblivion had many glitches great and small, including one which let players duplicate objects from the inventory. But instead of using this ability to keep potions handy for boss battles, one player decided to deliver a "gift" of 5000 watermelons to the King. And then start a fireball fight with the guards. The rendered scene played havoc with Oblivion's framerate, but it's hard to deny this was absolutely worth the effort.