Today I learned (TIL) that Darren Aronofsky loved Satoshi Kon's Perfect Blue (1997) so much that he obtained rights to it, which allowed him to incorporate plot elements and specific scenes into Requiem for a Dream (2000) and Black Swan (2010).
And now that I've learned this, I'm smacking myself for not realizing earlier that Black Swan is really just a live-action Perfect Blue that features ballerinas instead of idols. I knew it seemed familiar, but I simply didn't make the connection.