These alien like drifters are basically floating blobs of gelatinous death. They are among the most venomous creatures in the world and their sting is often fatal to humans. They administer toxins by use of their tentacles, which carry over five hundred thousand cnidocytes containing nematocysts. Those nearly unpronounceable words translate to harpoon shaped microscopic mechanisms that inject venom, so that you never, ever, ever want to get within even fifty feet of this creature. Heck, fifty thousand feet just to be safe! There is, however, an effective guard against their sting: pantyhose. No, seriously, pantyhose really will protect you, so if you're planning on taking a swim off the coasts of Japan, South Africa, or New Zealand this summer, you might want to pack a pair or two.