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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If you freeze it, and immediately set it on a naked flame, it should catch fire, but since its so cold, you'll see the gasoline "melt" and probably a second later turn into a fireball. However though, if it's in room temperature for less than 30 seconds, it revert back to its liquid phase very fast. Lighting it then should create the standard "Fire + Gas" combo.