The entire 102 episodes of this series. Sucks.
My reasons: ~The entire show runs off computer graphics and makes the characters move like there's no floor and I couldn't take my eyes off the characters and/or stop judging the animation to actually focus on the plot. I'm saying this after watching the first 3 episodes of each season so you know just how bad it is. I also sat through the agonising fact that this series isn't just 3min episodes but 24 MINUTES of hell. I'd probably recommend other anime or if you've seen the show I'm probably going to see you all in therapy. Please, I insist DONT watch.
(although I said reason(s) it's a sole fact that the animation is dead to me.