Why, it's only the hit anime/manga sensation that's been sweeping the nation! Attack on Titan! Hang on, the opening alone should help determine whether you should watch it or not: www.youtube.com/watch?v=8jTHfd… this is the longer version by the way.
But be warned: it's also very graphic and sad. Like, depressingly sad on most parts. It isn't til later episodes that things get "F*** yeah! Take that Titans!"