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It's very possible. It is similar to when you play a game for so long that you can turn it off and actually hear the themes in your head, perfectly. I had it happen a few years ago when playing Pokémon (who'd guess) and I heard the HG/SS gym leader theme as I was walking around my house. It was a bit strange and I had pulled two solid all nighters while playing it.

Thank you! You draw a cute Mimikyu. Hope it isn't like the one in the anime right now. Other person, that Charizard is amazing. Did you draw that? I don't know how to tag, apologies