What is the most traumatizing fucked up Anime you ever saw

I'd have to say....Tokyo Ghoul. But I've seen alot. Another is prett fucked up too.

I don't really get traumatized but I guess I can say School days.. not scary or anything but that ending was fucked up and crazy.. an ending you would never see coming.. he deserved it though.. Ohh.. and Boko No Pico.. what has been seen cannot be unseen