If you get very, very lucky when you're doing the dishes, the water streaming out of your tap might occasionally splash onto a bowl or spoon in just the right way [ieee.org] and spread out into a flawless hemispherical water curtain that means you can stop doing the dishes for a while to admire it.
Researchers at the MIT Media Lab’s Tangible Media Group have learned to do it on purpose. They’ve created HydroMorph [mit.edu]: a “dynamic spatial water membrane [mit.edu]” that can turn this pleasingly curvy splash into a flapping bird, form it into an interactive countdown timer, direct it into a cup, and do all kinds of other things that water shouldn’t really be able to do.
There's a video of the project worth watching. Cool stuff.