Remember how cracking knuckles used to drive your family and friends up the wall? Well, you can take this a step further by getting hold of the quirky knuckle-cracking simulator from Strapya World. At about $5 (500 yen), the Yubi-Poki virtual knuckle cracker can produce the cracking sounds as frequently as you desire.
Apart from being a collectible item, the device could be used as a practical joke to get people to crack up and have fun. The knuckle cracking simulator comes in three colors: white, red and black