If you've ever floated a ping-pong ball atop the warm blast from a hair dryer, you'll appreciate this video that endeavors to explain the physics behind how the same phenomenon occurs with jets of water.
Compared to a juggling busker on the street, keeping just a single ball suspended in the air isn't that impressive a feat. Until you dive into the explanations of how complex fluid dynamics and even Bernoulli's principle—which keeps planes in the air—factors into this naturally occurring liquid ballet. You'll never look at your garden hose the same way again. [Physics Central Buzz Blog]