This is a nifty fan-made animation of characters from Nintendo's Super Smash Bros. videogame series, set to one of the opening songs for this past season's smash hit (no pun intended) anime, Attack on Titan.
This animation is very well thought out. The scenes do a very good job of evoking the 'feel' of Attack on Titan with the established Nintendo characters. I would love to see this artist do another rendition using the other opening song (which is one of my all-time favorites).
Folks, it's worth your time to watch this one. Also, if you haven't checked out Attack on Titan, you can do so for free on Crunchyroll.