We were talking about fire one day and how it needs oxygen or it will extinguish.
To demonstrate, I lit a candle and then put a cup over top. Within a couple of seconds the flame went out.
When I asked the boys why the flame went out they said it was because it ran out of oxygen.
Then Jen said, "That's why you don't run if you are on fire, because it would fan the flame."
To which one of our more brilliant and slightly cheeky sons replied, "So if your on fire you should put yourself in a cup?"