This GoPro video from professional stuntman Ethan Swanson is equal parts awesome and terrifying, as he leaps from a multi-storey building in Chicago, down the roof opposite, before landing on a stairwell near ground level.
Swanson is a pro. Do not try this at home.
Crazy.
There's a moment in the clip just before the one-minute mark when you can hear Swanson - who again, does this kind of thing all the time - breathing heavily, like he's not sure this is his best idea.