If you live anywhere near a ski area or large amounts of snow, make sure you have a shovel and a sleeping bag in your car. The shovel comes in handy for getting stuck and building jumps, and the sleeping bag is good for getting stuck or partying or passing out in your car after partying
go with the shovel too Ive used mine a couple times building jumps and stuff.
i always have a bunch of pens and stuff too because i always forget when i get to school so it makes it easy to remember if you have something right there
TP! It's the most versitile thing, it's a box of kleenx, a rag, useful when nature calls, good for pranks (if you have a lot of it), good fogged-up-windows-and-I'm-in-a-hurry clearer... I never leave home without it.
"This beer smells like vomit... seriously... or maybe it's my vomit that smells like beer... I don't know, you tell me"
Ice scrapers are fine, but it doesn't always work so good on frost, or a very thin layer. That's when the rain-x comes in handy, it takes it off no problem. It's not really a bunch of chemicals, it's probably just some kind of saline solution that reduces the freezing point so that it melts the water.
Spare parts for your car (fuses, lightbulbs, hose clamps, etc), JUMPER cables, basic first aid kit, in the summer if you live in a hot climate bring along a gallon of distilled water, Tire pressure gauge,
you can always google this and get a ton of other ideas too.
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.
'I was strong to the net, not more dancing' - some Russian hockey player