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The owners of possibly the fastest punch known to science are marine crustaceans called mantis shrimps. They use specialised forelimbs to strike prey with shocking power. The force is so great that the mantis shrimps tear through the water, creating small implosions that generate heat, light and sound.
http://www.bbc.com/earth/story/20170605-the-most-powerful-punches-and-kicks-of-all-time