Corrected entry: When the Smiths are in the basement during the shoot out with their agencies, a grenade bounces in and explodes under a tank of fuel oil, causing a tremendous explosion that levels the house. First, the shoot out in the kitchen showed the house was using natural gas, especially when one of them created a fireball by disconnecting the line (who then shut it off?), you wouldn't have both fuels in the house. Second, fuel oil burns but is not that volatile and would not create such an explosion.
Sereenie
26th Jun 2005
Correction: A house can use both. For example, my parents' house uses natural gas for the range, but fuel for heating.
Sereenie