Stealing a car, driving while under the influence of alcohol or drugs or even travelling in a vehicle without wearing a seatbelt are all potential killers. Imagine the consequences of being responsible for the death of a friend because you were driving too fast or had too much to drink.
Don't get into a car with someone you don't trust or someone who doesn't seem fit to drive. And always wear a seatbelt, no matter how short the trip. It could save your life.