This was done for a T-Mobile Commercial, but they really did this at a Liverpool Train Station. It apparently took 8 months of preparation to pull this off.
If you like that one, here's one they did in a Belgium Train Station. I'd tell you more, but the video description is written in Flemish, and I don't speak Flemish. I do however, have a Flemish Giant Bunny. Maybe I should ask him to translate for me.