Fluid dynamics keep astonishing scientists. Every video or animation of a fluid dynamics experiment brings new information and provides stunning displays.
Here are a few video from the APS Fluid Motion gallery.
Starfish larvae generate vortices when swimming which it utilizes to capture and eat algae.
A cavity bubble collapses producing shock waves and a luminescence of 8000 degrees Kelvin.
Another video showing the generation of jets
A fluidic oscillator shows a pattern of alternating (separation) bubbles resulting in a sweeping get.
You can also find a selected collection of gifs at Physics Buzz.