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 ;-)

Mr. Scruff - Get a Move On

The Buffalo Analog - Ermack The Dirty Rat

Bastian Van Shield vs. Spencer & Hill - Cantina

Alle Farben - Danse (Drauf & Dran Remix)

Herr Tischbein - Sympathie