Because a pair of Russian and Ukranian daredevils have climbed to the top of the second tallest building in the world - with one very important thing missing - their safety harnesses.
The free climbers travelled to Shenzen, China to climb the Shenzhen Centre, which is still under construction, and the video of their adventure is guaranteed to give you seriously sweaty palms.
Vadim Markhorov and Vitaliy Raskalov completed the climb without any safety equipment, despite being almost 2000 ft off the ground by the end.
The smallest of mistakes could have led to certain death for the pair, but they seem remarkably calm throughout the footage, helping one another up when they get to the latter stages of the climb.
In the final part of the video, the two men are seen climbing to the very top of the construction site, standing victorious on the top and filming themselves with their GoPro.
Follow the incredible climbers on their Instagram pages here and here. But look away if you can’t handle death-defying stunts and intense heights - because their lives are full of them.