Do you know the one about the guy who tries to put out a fire with a bloody vacuum cleaner? Yes, me neither, because that's fucking stupid, right? Well, it works. [YouTube via Oh Have You Seen This]
Vacuum sucks air (oxygen). Kills off fire. Same concept if there's a kitchen fire on your skillet because you let the oil cook for too long. Apply a lid onto it. and wait. which should take the fire out in no time.