I worked in an aquatics store, and I told a new hire to be careful when working in the coral vats because the halogen lights got stupid hot (this was before LeDs and they were out the way of customers) so I told him not to touch. As soon as the words left my mouth, he stuck his fingertips on the light. Had to get him to A&E (accident and emergency or the ER for the Americans), and almost 20 years later, I can still hear the sizzle of skin