It's a common myth that if a person is stung by a jellyfish, another person should urinate on the sting to relieve pain. But that's simply not true. According to the Mayo Clinic, if you find yourself stung by a jellyfish, your best course of action is to remove any tentacles carefully with tweezers and soak the sting in hot water. Of , if a person gets a severe reaction or becomes unconscious after a sting, seek medical attention immediately.