If Youtube videos do not play reload the page, that's a Youtube bug.
Or maybe now, a few years later, it's a new bug ;-)

Variety Lab - London In The Rain

Gil Scott-Heron - New York Is Killing Me (Chris Cunningham Remix) (Full 3 Screens)

Andreas Tilliander - Back to the USA

Burial - Broken Home

Amon Tobin - Bloodstone