Depending on the impact site, a car crash can even spark a car fire. Most vehicles' crumple zones are designed pretty well, so the sheet metal absorbs the force of a blow and protects internal, dangerous spots like the engine, the battery and even the gas tank. But really, there's not actually that much of a barrier there, so a hard enough hit is likely to cause fluid leaks and spillage, as well as heat and smoke. And, as we know, high heat and spilled fluids create perfect conditions for a fire. Since it's hard for occupants of a crashed vehicle to see the extent of the damage while they're still inside, the threat of a fire might not be immediately apparent; however, it's always best to get away from a damaged car as soon as possible. Consider yourself lucky if you're not trapped inside a crashed vehicle -- even if it does go up in flames, at least you're a safe distance away.