Bubbles are all about surface tension and minimizing energy. Arrange things just right and you can even make square ones. (via JetForMe)
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Whipping Instabilities
When jets of liquid are introduced into an electrified medium in a process known as electrospinning, they can exhibit behavior known as whipping instabilities.
Dripping into Droplets
The Plateau-Rayleigh instability is one that just about everyone has witnessed. It describes how a liquid jet breaks up into droplets. Notice the waviness in the jet before breakdown. The tiniest curvature in the jet causes an imbalance in the liquid’s pressure due to surface tension. Because the system is unstable, any small changes will become larger, ultimately resulting in the jet breaking into droplets.
Can a Squid Fly?
Evidence is mounting that several kinds of squid will use jets of water to propel themselves into the air where they can actively fly some 50 times their body length.