This reminds me of competing against my friend, Kini, in Hawaii to create an air ring that lasted the longest from about 85 feet underwater. Kini and his wife, Ana, were scuba instructors and I'd tag along every once in a while. When Kini had some free time, we'd lay on our backs at the bottom of the sea floor near a wreck off of Waikiki. We would remove our regulators long enough to blow a ring of air, similar to smoke rings. The rings would sometimes rise close to the surface before breaking apart. That has to be one of my favorite activities of all time. The longer we'd goof off, the more light headed we'd get from all of the bottom time. Kini always won. He had more practice, goofing off. ;( Check out the video on this page of a large air vortex cannon. Amazing!
from gizmodo.com: "Massive Air Vortex Candle Cannon Built: It Blows, Bigstyle:
Baking a cake to celebrate 20 years in business wasn't enough fun for sub makers Erbert and Gerbert, oh no— they decided to build a man-sized air vortex cannon to blow out its candles. What's an air vortex canon, you ask? It's one of those big gun-like toys that fires puffs of air surprisingly far across the room."
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