Here's a robot video that I found interesting:
Reporting in the journal Nature Physics, William Irvine and Dustin Kleckner, physicists at the University of Chicago, describe the knotted fluid vortex they created in the lab -- a scientific first, they say. The knots resemble smoke rings -- except these are made of water, and they're shaped like pretzels, not donuts. Understanding knottiness has extra-large applications, including untangling dynamics of the sun.
More SciFri videos
Untangling the Hairy Physics of Rapunzel: http://www.sciencefriday.com/segment/04/20/2012/untangling-the-hairy-physics-of-rapunzel.html
Dive Into the Physics of Splashing: http://www.sciencefriday.com/video/02/06/2009/dive-into-the-physics-of-splashing.html
Cracking the Egg Sprinkler Mystery: http://www.sciencefriday.com/video/05/04/2012/cracking-the-egg-sprinkler-mystery.html