In order to be a part of Liberian society, you must learn the handshake. It begins with a normal, brief shaking of the hands but then you quickly move to a snapping of middle fingers. If you are good, you can consistently make a loud popping sound.
Initially, I was very uncomfortable with the custom. I felt like a 12 year-old boy snapping fingers with the Deputy Minister of Health or other prominent figures. A few times I avoided it all together by pulling my hand away before we finished the greeting.
Fortunately, I have matured and come to embrace the practice. Occasionally I surprise myself with a nice, loud, crisp snap.