Suppose you take an ice cube tray and use petroleum/gasoline to freeze some blocks of it. What would happen if you:
a) placed a cube above naked flame; or
b) threw a cube against a surface which caused a spark?
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The fumes are usually what ignite the gasoline, plus you'd have to throw it hard enough for the impact to get the frozen gasoline to ignition point. Then the spark would have to ignite it. [spoiler]Hows your throwing arm m80?[/spoiler]