+1 on the blinker fluid. My grandfather's favorite trick before he make petty officer was to send his newest apprentices to check the batteries in the sound powered phones.
I personally keep a SIG Sauer P229 in .40 S&W on the floor behind the passender seat or next to me in the seat when I'm in the car since I live and drive drive downtown a lot. It's funny this topic should pop-up I was wondering if anyone had any ideas for mounting a holster or a better way to secure the pistol from sliding around?
On a side note the trunk is big enough for my shooting bag, a .50 cal ammo can, one M1 garand, an Enfield, two finn mosins, and an AR-15 without loading the car down to heavy. How's that for trunk space