YouTube not high-def enough for you? Just synchronize four YouTube videos for quadruple the resolution! If you don't mind those YouTube logos and the transport controls splitting the frame in half, it's not too bad. To play it, go here, and then be sure to click the "play" link at the top of the page, rather than any of the four individual "play" buttons, and you'll see the four videos synced up perfectly. You may need to restart it a time or two for perfect sync.
Super HD? Hardly, but it's some clever web page scripting nonetheless. As for the video itself, well, the visuals are pretty nice, but you might not care for the artist. This could be the new way to Rickroll someone. You've been warned.
Via Mr. Doob