My personal favorite for flawed reasons is Madoka because I was there for the live reactions to the infamous episode and it was magical watching everyone lose their shit. It was also my re-introduction to anime after being shamed out of it for liking sailor moon as a kid.
There’s more than one, but googling “archive madoka episode 3 chan” comes up with multiple
:rat-salute:
Yeee, I’ll link the specific one I’m referring to if I can find before getting too sleepy. Multiple lokos deep at this point lmao