Even if you don’t do it, you probably have a friend or someone in the family who cracks his/hers knuckles every 30 minutes. Yes, it can be annoying, but is it dangerous? As revealed in a Vox video, that “crack” you hear when you crack your knuckles is really just a release of gas that makes a popping sound. However, this is different from the popping sound you hear when you stand up quickly or do any other sudden move that involves your joints. So, before you crack your next knuckle, watch this video. At least you’ll know if you’re doing something bad: