Bubble fusion. Debate about whether nuclear fusion could be applied here.

Interesting reading below. I came across the term while looking for more information on our previous discussion about triboluminescence quite a while back:

http://en.wikipedia.org/wiki/Sonoluminescence

Basically, extremely small bubbles emitting a burst of light when imploding under specific circumstances. In 2002, according to the wikipedia notes, shrimp were observed causing sonoluminescence, the phenomenon referred to as 'shrimpoluminescence.'