I mean, if it's been done, lemme know. I mean, the idea sounds shit and could result in Mary Sue-ish 'i wish i was normal instead of badass' but whatever 
Utterly and completely forgot names, but I've definitely ran into a handful of things like that over the years. Want to say someone was running a quest over on sufficient velocity or space battles themed like that at some point in the last year or two. Vaguely remember an old (like, from '02 or somethin', checking) bit of sailor moon fanfiction that indulged a bit... Nuke 'Em Till They Glow was the title, now that I hunt it down. Totally could be misremembering exactly what was happening there, because it's been more than a decade since I last read it, but eh. Actually think it's been getting relatively more common lately, generally as part of some sort of SI hook -- bodyswapped into a character they know is in for some trouble, usually proceeds to act like you might expect from someone with more foreknowledge than competency. Genre savvy character that's taking the piss out of things isn't particularly unknown, either.
Uncommon, but not unknown.
... actually, now that I'm thinking on it, I recall a light/web novel with the unlikely title of "An Otome Game's Burikko Villainess Turned into a Magic Otaku" that would probably fit the general concept. Main character gets reincarnated into a rival in a female targeted romance game/dating sim, pretty promptly basically freaks the fuck out and proceeds to spend life doing everything in power to derail the game's plot hooks so she doesn't get exiled/murdered/etc. Surprisingly good read, iirc, unless I'm conflating it with another work with the same story hook. One of those mildly amusing/enjoyable tales where a character is fairly clueless about exactly how their efforts are backfiring.
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Topic: Things that made you go "WTF?" today o_O (Read 14519022 times)