Robyn's asked about the worst burn while eating. What about cooking?
I was working as a fry cook at a local burger place in early 1980. One day I was using a burger spatula to cut down a 50 lb block of shortening as it melted into the fryer. At one point, the metal spatula slipped and hit the melted oil flat. The splash covered the back of my right hand with oil that was easily more than 300 degrees. Fortunately there was a sink behind me, and someone spun me around and shoved my hand under cold running water right away. There's no scar, just seriously painful memories.