Never throw water on a grease fire. While attending a fire Fighting Training school, this was demonstrated with a deep fat fryer set on the fire field. An instructor would don a fire suit and using an 8 oz. Cup at the end of a 10 foot pole, toss water onto the grease fire. The water, being heavier than the oil, sinks to the bottom where it instantly becomes superheated. The Explosive force of the steam blows the burning oil up and out. On the Open field, it became a thirty foot high fireball that resembled a nuclear blast. Inside the confines of a kitchen, the fire ball hits the ceiling and fills the entire room. Also, do not throw sugar or flour on a grease fire. One cup creates the Explosive force of two sticks of dynamite!!