Why did luigo galvani do the frogs legs experiment?

Luigi Galvani didn't intentionally do the frog leg experiment. He was working with static electricity by using frog skin. When he took the metal scapel that he was using during the static electricity experiment, it became charged with static electricity. When he identically touched one of the the frogs' nerve, the frog leg twitched. This helped us later understand that our nervous system practically works on electrical impulses/signals.