…And where able to take one piece of media, and all the necessary equipment to make it work, back into the past to show one person "the future"…
What would this media be? How far back would you take it? Who would you show it to?
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I would take The Legend of Zelda, Twilight Princess back to when the first Zelda was released, have a kid from that era play it, then have that kid painstakingly wait for 20 years for it to be released. :3