Bursting your bubble

From the BBC, bubbly coolness:

With the help of high speed video, scientists have discovered that there is far more to bursting bubbles than meets the eye.

Under the right conditions, a bursting bubble on a liquid surface does not simply vanish, but creates a perfect ring of tiny “daughter bubbles”.

This occurs as the ruptured bubble retracts into the liquid, forming a doughnut shape of trapped air.

Bubble bursting image from the BBC