Modern materials engineering allows us to build what looks like precarious glass skywalks perched thousands of feet off the ground. They’re completely safe, but knowing that doesn’t make them any less terrifying to traverse—especially when the glass skywalk you’re on uses transparent LCD screens to make it look like it’s about to shatter and collapse. Glass bridges are scary. Seeing exactly how far you’d fall if the bridge were to break with every step will mess with anyone’s head. Which is why this prank on a glass bridge in China — where cracks are shown spreading across the bridge panels and loud cracking noises play, is something only a psychopath could dream up.