One of the best anime shows of the year 2013 by production I.G. The graphics and atmosphere will blow your minds out but the theme has raised debates. It's one of those shows where tons of people die in battles, including your favorite ones, so if you really hate that, you might not want to watch it.
I'm not gonna give out any kind of spoilers, not even the summary, because it's more fun to watch if you don't have any idea about what you're going to see. If you're that eager for a summary, go read the wikipedia page.
Dude 1: Yo, checked out Attack on Titan yet?
Dude 2: I told you I can't stand the horror genre.
Dude 1: Too bad man, you have no clue what you're missing.