Portuguese Man o war
These are creatures that live in the sea, I also got stung by one in Hawaii
Portuguese Man O' War (Physalia physalis), is a jellyfish-like marine invertebrate of the family Physaliidae. Its venomous tentacles can deliver a powerful sting. Despite its outward appearance, the Man o' War is not a jellyfish but a siphonophore, which differs from jellyfish in that it is not actually a single creature, but a colonial organism made up of many minute individuals called zooids.