OK, so he doesn't have a heavy cloak and half-a-dozen weapons weighing him down, and he's not being chased by the local constabulary, but this guy still does a damn good impression of Assassin's Creed's trademark climbing.
I'd always figured the game's creators took a few liberties when it came to the speed with which you could shimmy up a vertical wall, using only a few cracks and bricks as footholds, but shows what I know.
Apparently the guy is a street performer who does this all the time (hence the powder "stains" on his regular holds), but no amount of familiarity takes way from just how impressive this is.
Assasin's Creed Real Life [YouTube, via Geekologie]