BoomClips (Possibly NSFW)
It's basically an underground version of YouTube with no whiney kids, spam videos, boring videos, or advertisements. I have yet to find a clip that is uninteresting! Unfortunately, because it's not as popular as YT, there are less uploads per day. But, this is probably a good thing. The quality of material on there will make you wonder why you use YouTube for random entertainment.
I appologize if more people know about it than I thought. Personally, I had never heard of it, so I thought I'd share it with my fellow time-wasters!
I said "possibly NSFW" because there is occasionally violent or offensive material that turns up every once in a while. It's usually fine IMO.