Drrzzzt. It was the faintest click, the slight sound of sparks flying. "I realized what was happening immediately," says the surgeon. "I said to myself, 'That sounded very electrical.'" As he pulled back the drapes from the patient's face, whoosh!, a bluish flame raced across the tip of the nasal cannula. He smushed the drapes to snuff the fire. It was out in seconds, but the damage was done: The man who came to the surgery center to have fat pads removed from his lower eyelids wound up at a burn center with first- and second-degree burns to the middle of his face and one nostril.