The video uses Macklemore song "Thrift Shop", rewritten with Chivalry style lyrics by the video creator, MattShea369.
Macklemore Makes One Of Chivalry's Worst Weapons Awesome
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The Switch won't have Netflix or any other video apps at launch, but it will have a Mii Maker app. No video capture, sad to say.
Nintendo has yet to say anything about how the Switch will approach classic games, which means there's still hope that they won't screw it up. Very slight hope. But we'll take what we can get.