keep some silverware in there (fork, spoon in the glove box or soemthing. I always seem to end up having food like spaghetti or something and nothing to eat it with. Also a sharp knife is good, like a swiss army knife, you never know when that will come in handy. Booster cables like someone said already, a blanket/sleeping bag, shell jacket/raincoat, flash light, pair of sunglasses. When I'm at home, I soemtimes leave my licence in the car because I always forget it inside if I don't. Toilet paper and a shovel is a really good idea, like someone said already. if you have room, some sandbags in the trunk are good, because they add weight for extra traction and if you get stuck you can bust them open and spread sand under your tires for traction. ice scraper, 500 mL bottle of motor oil too.