In Panic Room, Jodie Foster and an adolescent Kristen Stewart fight off intruder Jared Leto. Jodie’s character is cornered at some point, but sees a dramatic chance to escape by lighting propane on fire. She and her daughter cover themselves in fire blankets, and blow up a tank of propane, thwarting the robbers. The protagonists are only safe because the propane rises to the ceiling. Scientifically, though, the propane would actually have sunken to the floor, as it’s heavier than air.