This shrimp smashes things with it's "claw hammer".
It hits so hard that the force of the swing causes a small amount of water to boil and produce light.
I swear that's what it says and shows in the video in slow motion :
Use link to jump to 3:04 in the video :
http://youtu.be/zcWxAfl0okE?t=3m4s
That background music gets you into it doesn't it?
