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 ;-)

Dan Le Sac vs. Scroobius Pip feat. Flux Pavilion - Gold Teeth

Dan Le Sac vs. Scroobius Pip - Sick Tonight

Dan Le Sac vs. Scroobius Pip feat Kid A - Cauliflower