We've seen giant waterslides on YouTube before, and have come to expect footage from them to be extensively doctored. But this clip, filmed last Saturday in Paradise, Utah, and released this week by youth apparel brand Vooray, appears to be the real deal—and is pretty badass. Director Devin Graham and Vooray first built an enormous slide down a hillside next to a lake. Then they hooked up an inflatable raft to a bungee cord pulled by an ATV. Finally, they whipped the raft down the slide, over and over, catapult-style, at high speeds, sending its riders up a ramp and careening out over the lake. Graham admits the stunts were dangerous—he claims several people were knocked out when they hit the water—but that he took every precaution. He writes on his blog: "They originally used a bungie to sling people out, but a week before we filmed, when they were testing it, it snapped . . . and whiplashed a couple people. So, to make sure it was safe, they bought a $250 bungie online to make sure no one got hurt when we filmed." (In other words, if it's fake, they're building a pretty elaborate lie around it.) Everyone wore helmets and life jackets. Graham didn't jump himself. He explains: "I'm not that brave, or stupid, depending on how you look at it." The video is certainly prompting all sorts of envy on YouTube. Writes one bitter, long-in-the-tooth commenter: "If you're young and you ain't doin this kinda shit, you're wasting your time and you're gonna regret the fuck out of it when you're older."