From Youtube A-lister Devin Supertramp, the guy who bought us Assassin’s Creed meets parkour in real life, trike drifting and the world’s largest rope swing comes Urban Surfing Down The Streets of San Francisco, which, come on now, let’s just call it what it is – a massive fuck off water slide – a GoPro’s dream showing us what would happen if you put a giant water slide down the hills of San Francisco. The answer? Everything.