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 ;-)

Dare & Haste - Residual Image of Detroit (Adverse Event Remix Music Video)

Mutant - Aum

Pink Floyd vs Underworld - Born Slippy Brown Acid (Jonathan Peters & Hani Mix 1)

Call Super - Threshing Floor

Blawan - Why They Hide Their Bodies Under My Garage