I'm going to say Boko no Pico. I literally just watched this a few minutes ago.(and regretting it) This was quite possibly the most scarring thing I've watched since two girls one cup. (if you have not seen two girls one cup I would suggest against watching it)(however should you decide to watch it I would not recommended eating while watching.) worst mistake of my life. BUT I DIGRESS. What's the most scarring anime you've watched? do you agree with my choice? let everyone know in the comments below!