Fire Extinguishers for Cars

[vinj]

But NEVER put the fire extinguisher on the vehicle's a-pillar if you intend to use the vehicle with a front passenger on board. In the event of a crash or rollover, the front passenger's head can strike the pillar and the sharp edges of the fire extinguisher mechanism can cause more injury.

That's the crazy thing with some people (like the Civic posted above), the passenger can bash his head on that in the event of an accident; the same goes with some roll cages on a daily driven car (unless you want to ride around with a helmet).