Here is a video of Justin Bieber hanging on to a moving vehicle, while riding a skateboard. Obviously, this is a dangerous thing that no one should ever do. It's also very questionable in the case of Justin Bieber, considering he has access to millions of dollars and could easily engage in such thrill-seeking activities as sky diving, bungee jumping or even going on the Space Mountain ride at Disney World. The options are really endless! But, no, le petit Candian is a man-boy of simple pleasures, content to spend his Saturdays "ridin down fairfax lol had a great time."
UPDATE: Apparently, Bieber's skateboard "stunt" was a relatively slow-moving and mundane, rather than life-threateningly dangerous. If you have nothing better to do, you can watch this alternative video posted by TMZ, in which Beiber is pulled through the street at what can't be more than seven mph, or you can watch this other video of a cat mommy hugging a baby kitten, whatever, choose your own destiny.