I've been seeing a lot of dementedI shows lately and it made me wonder what is the most disturbing scene or WTF scene. Obviously for me it is Fionna and Cake. And I think you can tell what is disturbing there.
most disturbing episode... well... either a glitch is a glitch or Too old... in one it's just a fucking weird ass episode that starts out with a girl eating her hair on a little screen... the other is a fat lemon completely devouring another lemon...
For Adventure Time, I'm going with any episode that has Fiona & Cake as well, as I hate Rule 63 with a passion, (though Ice King insinuating that Finn is his ideal woman is quite funny because it crosses so many lines).
But if you mean "most disturbing animated thing," it's going to be Zero Apocalypse, Mad Bull 34, Violence Jack, Dead Leaves, Grave of the Fireflies, Barefoot Gen, Now & Then Here & There, Furi-Kuri, Green Legend Ran, Serial Experiments Lain, Shadow Star Narutaru, Eikan, Bludgeoning Angel Dokuro 2, or some other R rated anime.