Dutch photographer Alexander Augusteijn uses a high-speed camera to capture the instant after a bullet slices a drop of water, showing the physical break between the top of the droplet and the rest.
The challenge of Augusteijn's photographs is not just in properly lighting and capturing the image; it's also in ensuring the bullet meets the droplet. He places a carefully measured amount of water in a time-release valve. Once the drop reaches a certain point, the gun is fired automatically, simultaneously triggering the camera's flash and shutter. The whole process takes 28 milliseconds, but gives us these fixed fluid dynamics photos. You can see more photos (including his setup) at Amusing Planet and at his website.