In a long interview with the Wall Street Journal, Gates admitted to like watching pirated movies on YouTube.More details at The Inq.
The interview went thus:
Hack: You watch physics lectures and Harlem Globetrotters [on YouTube]?
Gates: This social-networking thing takes you to crazy places.
Hack: But those were stolen, correct?
Gates: Stolen's a strong word. It's copyrighted content that the owner wasn't paid for. So yes.
Even Bill Gates views pirated videos

Even Bill Gates, world's richest man, views pirated videos on the Internet: