Jumper cables and work gloves in the car. I know these are things that(I thought) most people carried, but apparently most people don't. My wife's car suffered a dead battery a few weeks ago. Two city trucks, an Orkin truck, and two private vehicles didn't have cables. A third private vehicle had cables, but didn't know where the battery or owners manual was in his car?!? If I wasn't able to get down there, she would have needed AAA for a jump.