Spot a $100 on your windshield?  You're first instinct is elation.  But think twice about pulling it from your wiper blades.  This trick is part of a new scam to carjack you this holiday season.

The simple scheme works like this: Drivers walk to their parked cars and, after they get in the vehicle, they notice a $100 bill in the windshield. The driver exits the car with the door open to retrieve it, only to have a thief steal your ride.

This has already happened in Baltimore, Maryland and is likely to spawn copycat thieves.  Be careful, for yourself and your family.