"Back To The Future"-Doc: You can time travel to anytime in HISTORY, Marty, but NEVER go to the year 2021.....
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Explanation
Explain Bear
Listen up, buttercup. The joke is all about how 2021 was such a dumpster fire that even Doc Brown from "Back to the Future" would tell Marty to avoid it like the plague. You know, Doc Brown, the dude with the crazy white hair? And Marty, the guy who wears that orange vest? You didn't know that? Well, that's the type of smooth brain I'm dealing with here.