The mantis shrimp lays claim to owning the fastest and tastiest arms of the water bound kingdom. If Chuck Norris lived under water, he would drown and die. And a mantis shrimp would punch a hole in his carcass.
Those tiny boxing gloves aren't for gardening.
The speed of the mantis shrimp's punch is delivered at some 50 mph. Keep in mind the shrimp is doing this in water. If you've ever stupidly wrestled with friends at the beach, you realize how your devastating roundhouse winds up moving in slow motion as you slosh through the surf. Think how strong you'd have to be to punch through the water as fast as a moving vehicle.
The mantis shrimp's power comes from the two club-like arms it keeps behind its head. It locks those arms in place allowing energy to build up in the muscles. For an added "fuck you" there's an organic spring mechanism in the joint that adds extra force.
So when the local shrimp from Cobra Kai start shit, the mantis shrimp unleashes the force of the muscle which, when combined with the added oomph from the uncoiling spring, means the weapon is released at an acceleration which can reach 10,000 times the force of gravity. That's kind of like being punched by Mike Tyson in his prime, if his outstretched arm was attached to a meteor as it entered the atmosphere.
How Badass is That?
In captivity, the shrimp have been known to punch through aquarium glass, totally fucking up people's rugs. In fact, the punch of the mantis shrimp is so fast, it actually lowers the pressure of the water in its path which--conveniently for a badass sea-ninja who fancies some pre-cooked crab--boils the water around the punch. Steven Seagal's probably only done that once or twice at best.