Destin Sandlin explains why you often see water droplets dance or bounce on the surface of water instead of coalescence occurs. This video features astronaut Don Pettit, who did a cool experiment in space: He attached a big water bubble to a speaker, then inserted an air bubble into it. When he played cello music (by Yo-Yo Ma) through the speaker, little water droplets would detach from the water and bounce around inside the air bubble.