Characters that are weaklings, cowrds and that deserve to be beaten to death.
Animes where you see gallons and gallons of blood flowing per episode.
Anime whose music, not only the oppening and ending, I think it's cool.
Anime that I watched or dropped that weren't what I expected and turned to big dissapointment.
If you love the anime so much and the new episode isn't online yet or the anime ended in a shitty way you'll get so curiuos and anxious that you'll start reading the manga.