It's not exactly the same, but the meta aspects of savegames in the babelfish puzzle in the Infocom classic Hitchhiker's Guide to the Galaxy produced a really interesting effect when I first encountered it as a kid, a realization that there was a designer playing with me to achieve a specific reaction that was tied up with my expectations for what playing a game was supposed to be like.
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You must've been a smart kid! I couldn't even get out of the bedroom in that game >.<
Mentioning old Infocom games here led me to download a parser and play Planetfall again, one of the first video games I ever played. Amusingly, it's also relevant to the original topic of your post: if you ever do the "save" command while your NPC friend Floyd the robot is in the room with you, he'll say something like "Ooh, are we going to do something dangerous now?".