Some tools, flashlights, first-aid kit, a small tarp, a quart of oil, a gallon of water, spare bulbs, a shop rag, gloves, a hard hat and vest, and my golf clubs because my wagon has more storage space than my apartment...

 

I keep a little card in my glovebox with a list of my credit cards and other things in my wallet. I don't list the account numbers, just the phone numbers I can contact should my wallet get lost. There are other ways for the credit card companies and banks to be able to identify you should you need to talk to them.
____________________________________
Woodworking Plans
Steak London

 

I also have new car so all the stuff is new and I am big music lover so all the collection of my songs is in the car. If we talk about the tools then all the tools with spare wheel and one base ball bat for the safety.

 

chainsaw, flame thrower, hatchet, fire extinguisher, case of beer, and a spare fuel pump relay.

 

My 245 has that neat large locking compartment in the rear. I keep it packed with things I might need like-
the most recent take-off accesory belts and timing belt
spare fuel pump relay
lots of tools, well packed to minimize rattling
Anco tie down straps (4)
the reciever and pin for the trailer hitch
Heavy gloves
spare bulbs
medium sized wilderness first aid kit
Dive/abalone knife
Hi vis green vest with Western Soil Stabilization on it-lets me be seen in a lot of places without questions asked.
12v air compressor
3-pack of condoms ( for emergency water carriers-that's what I tell my wife)

 

Move to a planet that doesn't have any wind or dirt or anything that can be considered as making your car dirty. Getting a different color on your car can reduce how much your car appears to be dirty. Black is horrible is shows every little piece of dust possible.
====================
Breast Augmentation Breast Enlargement

 

Tissues, extra pair of jeans, shoes flashlight, towels,random tools,random parts, jumpers.

 

What's the extra pair of Jeans for? In case you have to push the car out of the mud (or is that what you tell your wife?)

 

Update: I have done a lot to clean out my cars and I'm fighting to keep it this way:

Spare tire.
Volvo tool kit.
Jack
Hand wipes.
Box of tissue.
Cassette adapter.
Car/phone charges.
Airpump in the 850 T-5R (for flats with the low prifile tires).
Air guage.
OBD-II reader.
Owners manual.
Change.
Bank deposit slips.

 

Almost nothing. I had my car broken into before so I go with the bare minimum.

 

I use to keep my goggles, paper napkin, some chocolates not always but sometimes, air freshener and first aid box.

 

Trunk: Bag of clothes (and shoes), first aid kit, fire extinguisher, tool kit, jumper cables, duct tape, shovel, rope, paper towels, flash light, spare batteries.
Inside: GPS, napkins, notebook, toothpicks, gum (and sometimes small candies), calculator, pen, lip balm, sunglasses, reading glasses, towel (dry and wet), peanuts, snack bars, water, atlas

 

First aid kit, jumper cables, toothpicks, gum, change, tools (for when i hit the junk yard) and usually a few mix cds

 

Very interesting...

 

i dont like my car to be a garbage place so i just keep my sunglasses and mobile charger .

 

Not much...toolbox and some coolant in the trunk. Other than that, my insurance papers and a tape deck adapter. That's all that's in my Mustang...ain't got much of anything in the Volvo.

 

Flashlight
Glasses, in case contacts fall out
Sports equipment (Frisbee, baseball bat, baseball, glove, soccerball, cleats etc.)
Ice Scraper
Umbrella
One of those fold-able Chairs
Owners Manual
Some change and receipts
During the summer I normally have like 50 empty water bottles in my car.

 

I also keep my riding gear in my car for when I get to work - some days, I get paid to ride motorcycles

 

As many as possible. Usually a flashlight, chaisaw, flame thrower, case of beer and multi-tool

 

AS many what as possible? Dead people? Then you drive off in the night, cut them up, set them on fire, & watch them burn while you drink the beer? What is the deal with that equipment. (Maybe I have seen to many of those Saw movies).