If you’re feeling stressed and want everyone to know when they’re driving you crazy, you need this Japanese toy. It simulates the sound created when you crack your knuckles. It may not strike the same fear as some massive guy cracking his knuckles, but they’ll still get the idea. It also when held straight pushes pressure points to relax you a bit. To make the cracking noise start, just bend it. It can be purchased for $5, but is a Japan product, so it might be hard to get.