Osteoarthritis is the most common chronic condition affecting our joints. It is due to the inability to repair damaged joint tissues and occurs frequently in the hands and fingers, that can lead to the breakdown of cartilage. This can then cause pain, swelling, joint stiffness, and inflammation of synovium. Fluid exists in the metacarpophalangeal joint, also known as the knuckle. This fluid is called synovial fluid, and once applied with pressure, gasses dissolved in this fluid bubble out, and eventually collapse. This collapse causes the cracking sound. This video touches upon both the scientific biological aspect of knuckle cracking as well as the social aspect behind it. It aims to debunk the myth that knuckle cracking can cause osteoarthritis later in life. Also included is an interactive straw poll about knuckle cracking.