Let's get some things cleared up. Cars will generally not explode during or soon after a collision; unlike movies and video games. However, often enough, when the crash circumstances are just right, the fuel tank and/or other parts of the vehicles containing engine oil, transmission fluid, coolant, brake fluid and in some vehicles hydraulic fluids, the reservoirs/tanks holding these fluid can break resulting in its fluids pouring out all over the place. Not all these fluids are flammable for but we all know what gasoline vapor can do when mixed with oxygen. So in essence, when we see a car erupt into flames, it did just that, and it happens often in enough during serious crashes. The impact is so brutal and sudden that the fuel tank will rupture, gasoline will gush out and fan out into the air, and with so much metal in a car all you need is a small spark to ignite the fuel and air mixture. Combustion occurs and quickly the car becomes engulfed in flames. It did not explode but rather, the combination of a violent impact followed by an immediate fuel spill and its ignition can feed our illusions that cars do sometimes explode on impact. In reality cars only explode in Iraq.
I heard somewhere that if you smear an Egg McMuffin on a car it will explode!!! Or was that C4? I always get those two confused...
NAH M9 MY CAR EXLPODE EVRYDAY. EVRY CAR EXPLODS AT SOM POINT!1!1one!1 But seriously, listen to this guy. Cars don't explode, they just (rarely) ignite a fire. Doesn't happen a lot, because it's, well, NOT supposed to happen.