What's in your "Bad day bag?"

First and foremost, my H+K USP .40 compact.
Fire extinguisher, extra alternator, extra set of points, spare tire, tools, extra drive belt, flashlight, extra batteries, small lightweight floor jack and a thick piece of plywood for jack support on soft ground,road flares, and reflective marker stands, first aid kit, extra water bottles, cleaning supplies, blanket, extra coat, toilet paper.
Gas can!!