If you've ever floated a ping-pong ball atop the warm blast from a hair dryer, you'll appreciate this video that endeavours 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]