The blue-ringed octopus looks like it stepped out of a psychedelic dream, but its true nature is a lot more dangerous. It uses a powerful neurotoxin that paralyzes the respiratory muscles of its prey. If someone gets stung, they would need to seek immediate medical attention or suffer from death by asphyxiation. It certainly is pretty to look at, but it’s best to just keep away. Sometimes keeping away won’t help at all, especially if contact isn't needed in order to be harmed.