In my car, I keep a semi-cheap 5" lockback, and a sharpened Spetnaz shovel. Definantly thinking I need to add an extinguisher.

Right now, I've also got a broadsword in the back, I keep meaning to bring it in, but given that the pommel is more than heavy enough to break glass, it's length, and the fact that is basically an overbuilt crowbar, I'm almost thinking it might stay there.