Ever since the episode of Friends in which Chandler peed on Monica's jellyfish sting to take away the pain, many beachgoers have considered this to be a surefire remedy. Researchers are less convinced: Some studies agree that it can help, but others don't. A better jellyfish sting treatment? White vinegar. "Urine is renown around beach areas for jellyfish stings, but in reality it's a poor second to plain vinegar. In most studies urine really does not help as much as you often hear--but plain white vinegar does," says Dr. Anderson. He recommends first getting out of the water, removing the stingers and then applying vinegar. If the pain spreads or you develop a rash or other reaction on any area of the body, go to the emergency room immediately.