Just for the record it doesn't have to be an electrical appliance that catches on fire. Years ago I was dampening clothing to be ironed ... had a clear glass pop bottle filled with water and fitted with a sprinkler top sitting on the kitchen table and a pile of clothes to be dampened piled on a chair nearby ... all of a sudden I noticed smoke billowing out of the center of the pile of clothes. Called the fire department because I just couldn't figure out what had just happened. Evidently the sun was shining through the 3 large kitchen windows and through the clear glass bottle of water which acted as a prism generating heat which focused on the clothing and caught them on fire. Who would have thought???????????