Many serial killers attack their victims by pulling them into their vans while the women are attempting to get into their cars. Look at the car parked on the drivers' side of your vehicle, and the passenger side. It is always better to be safe than sorry. Better paranoid than dead. Always take the elevator instead of the stairs.
Stairwells are horrible places to be alone and the perfect crime spot.
Do not get on an elevator if there is a weirdo already on there. Of course bad men don't always look bad, so use your judgment. Do not stand back in the corners of the elevator, be near the front, by the doors, ready to get off or on. If you get on the elevator on the 25th floor, and a suspicious-looking person gets on the 22nd, get off when he gets on. Even then, it most likely will not be a vital organ.