What do you get when you combine parkour, the art of extreme freestyle walking, with a moving vehicle? If (and only if!) you're a trained professional, the result is a series of breathtaking stunts that seem more fit for "Fast and Furious" scenes than real-life streets.

In this video, parkour group Substance Over Hype leaps from car to car, switches drivers by way of an aerial flip through the sunroof, and skateboards on a wall while holding onto a car -- all while said cars are IN MOTION. The sheer level of acrobatics and fearlessness is truly jaw-dropping. It's basically the stuff of our mom's nightmares and a quick way to get your vicarious adrenaline fix for the day. Check it out below.

Did we mention not to try this at home?