Worst Fics to Read Fandom Blind

Ok… I have a weird itch I need to scratch. If you know any fanfics that DEFINITELY 100% require prior knowledge of a fandom, please recommend them! The more confused I’ll be without context the better.

(Nothing NBC Hannibal related because I’m actually in that fandom lmao. Preferably no Harry Potter or MHA either since I already know a lot about them)