Giggle
I think the best part about that movie is the fact that it wouldn't have exploded if the jar had broken immediately. Gasoline only ignites when it is a gas, not a liquid, so the jar sitting there for a while is what gave it time to evaporate and accumulate as a gas.
Needless to say, the burning gasoline would have flown everywhere even if it hadn't evaporated very much yet. So...
Fire is fun.