SONOLUMINESCENCE - MAGIC SHRIMP

The pistol and mantis shrimps are both crustaceans that snap their claws and preform magic. 

The jet of water squeezed out from between their claws travels at such speeds that it cavitates. That is, the liquid water under negative pressure is literally pulled apart into bubbles of water vapour. When the bubbles collapse in on themselves, they give off a loud snap and amazingly a small flash of light. The shrimp use the sonic shock wave to stun or kill prey, but physicists are far more interested in the flash because we still don't know how it happens. 

Collapsing bubbles can also be created in a laboratory simply by using sound

Since sound as we know is basically just molecules repeatedly pushing against each other and then pulling apart. If the sound waves are intense enough, the low pressure will again be low enough to pull the liquid apart into vapour and cause cavitation bubbles. The bubbles then collapse and in certain circumstances produce light even brighter than the shrimp, this phenomenon of turning sound into light is called sonoluminescence.

https://wifflegif.com/gifs/129608-smarter-every-day-sonoluminescence-gif

 We know that the light flashes are incredibly short, lasting only around 100 pico seconds (0.00000000001 sec) and are surprisingly high energy. The collapsing bubbles may reach up to 50,000 degrees kelvin which is 10 x hotter than the surface of the sun. We don't know for sure though, how the inside of the bubble gets that hot. Or what exactly is giving off the light. The bubble collapses so quickly that the gas inside are heated by compression.

Possible light sources

The increase in pressure might also cause the water vapour to rapidly condense back to a liquid releasing large amounts of latent heat. 

The light its self might come from glowing argon or xenon gas in the air bubble.

The light may come from the heat tearing water vapour apart into hydroxide and hydrogen ions which then recombine to form water and give off light.

The whole interior of the bubble may become  hot enough to become a glowing plasma.

Perhaps it is caused from a combination of the above.

Either way, the cool thing about sonoluminescence is that its still not fully understood despite being fairly simple to create, I mean you can buy a basic sonoluminescence kit off the internet (http://www.sonoluminescence.com/) , or you can just get a pet mantis shrimp.