This seems like something you're likely to know the answer to (question prompted by following the 200 word RPG posts): Is the origin of wording capitalization like, "You are a NOUN. You are trying to VERB," etc. a relic from parser IF? My best guess is that it originated as a way of making it obvious that those words are code-interactable objects, but that's very much only a guess; I have nonzero but not very much experience with parser IF.
If we're being perfectly honest, most people who type like that in this day and age do so because they saw it in Homestuck – though Homestuck is, in turn, parodying early parser-driven interactive fiction, which often set words in all-caps to indicate that the player could type those words into the prompt to make something happen, so you're right about the ultimate source, if not the proximate one.
(The "you are NOUN" formulation in particular is indicative of having gotten it by way of Homestuck; actual pre-Homestuck parser fic rarely capitalised the player character's name in this way, because the player character's name was not the noun you'd type to interact with yourself – that was customarily ME.)
