Tell your spouse,your children, your neighbors, your parents, your Dr's office, the check-out girl at the market, everyone you run across. PUT YOUR CAR KEYS BESIDE YOUR BED AT NIGHT.
If you hear a noise outside your home or hear someone trying to get in your house, just press the PANIC button for your car. The alarm will be set off, and the horn will continue to sound until either you turn it off or the car battery dies.
If your car alarm goes off when someone is trying to break into your house, odds are the burglar/rapist won't stick around. After a few seconds, all the neighbors will be looking out their windows to see who is out there and sure enough the criminal won't want that.
This is something that should really be shared with everyone. Maybe it could save a life or a sexual abuse crime.