YouTube Higher Quality Video Button

I just noticed this while looking at all the April fools I have compiled on my last post. But one of them was for Virgle, the Google and Virgin human settlement on mars. Linked to it is a YouTube post by Sergey and Larry of Google.

On that YouTube page there is a little link underneath which runs JavaScript that changes the video to higher quality. (screenshot below). The higher quality looks like video should if the video resolution is the same as the players dimensions. It looks really crisp and clean.

Has anyone else spotted this on any other videos? What do you think?

Ollie

PS This is not an April fool, that I know of! Check out these April fools.