Photo of a Punctured Water Balloon...

It may not look like it- but this is what happens when you puncture a water balloon with a needle. This was photographed at high speed (1000 frames/sec) in a laboratory. Since the rupture process is on the order of milliseconds, the initial impact of the membrane retraction on the bulk fluid can be observed without the significant interference of gravity. I think this is pretty darn cool looking. Click the image to watch a video.