My wife needed to get her car jump started today.
I am always wary of jump starting a car because I saw a car battery explode into someones face when they attached the jumper cable incorrectly.
The battery acid went into his face. We rushed him into our house and washed out his eyes. After he was taken to the hospital, we were told that he was very lucky to have kept his eyesight.
Please read this page that explains how to jump start a battery, in case you ever find yourself with a dead battery.