<P> Beshkan (Persian: بشكن), also known as the "Persian snap", is a traditional Iranian finger snap requiring both hands . The snapper creates a crackling / clicking noise similar in mechanism to the normal snap but louder in practice . </P> <P> There are two variations of the Persian snap . The most common of the two for a right handed individual is as follows: </P> <Ul> <Li> Place hands together and rotate until the three right hand fingers are at the junction of the hand and fingers . </Li> <Li> Rest the right middle finger on the left hand securely . </Li> <Li> Then using the tension provided by the left thumb, snap the right index finger onto the gap between the junction and right middle finger . </Li> </Ul> <Li> Place hands together and rotate until the three right hand fingers are at the junction of the hand and fingers . </Li>

Where does the sound of snapping fingers come from