The Biggest Mistake You Could Make is leaving the window open even one inch can be just what it takes for a car thief to easily steal your car.

Most people believe that they can leave a little air in the car with the windows opened just a crack, but that no one can get into the vehicle.

A car with a window cracked opened was an unlocked car.

“A window that has enough room for me to stick my fingers in, I can get out of its track by rocking it back and forth until I get it out of the track,” Fuller explained.

“Then, I can pry the window out of the track enough to where I can get my arm down in there and unlock the vehicle.”