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Sebastian Staacks, a genius with far too much spare time on his hands, worked out a way to watch movies on an original GameBoy. There are a ton of compromises, but if you'd like to see how he did it, check it out:
https://gizmodo.com/turns-out-the-nintendo-game-boy-is-the-worst-possible-w-1848295094
https://www.youtube.com/watch?v=cxs_nHnqNB0