Today's aesthetic: cosmic horror tabletop RPGs from the 1980s whose creators wrote the "madness rules" by simply plagiarising a list of disorders and their descriptions from the DSM-II and turning it into a d100 lookup table, except the DSM-II still listed "homosexuality" as a mental disorder (it wasn't removed until the DSM-III), with the result that there are several published tabletop RPGs where there's a small but non-zero chance that seeing Cthulhu will make you gay.
(Amusingly, one such game was later re-used as the core system for a licensed Teenage Mutant Ninja Turtles RPG, and the madness rules were carried over verbatim, with the result that seeing Cthulhu can also make your ninja turtle gay.)