In something that feels like the perfect evolution of Internet video, YouTube has started experimenting with 4K 60FPS video playback. But, there's only a few clips that are capable of this insane amount of bandwidth.
Most of the videos on YouTube are nowhere near this resolution and framerate, with most cameras not capable of shooting 4K 60FPS video to begin with. In order to watch the 4K 60FPS videos on YouTube you're going to of course require a 4K 60Hz capable panel, which aren't too hard to find now.
There are just six hand-picked 4K 60FPS videos on YouTube right now, with the 4K 60FPS playlist on YouTube available here.