Locking Your Cars!

Back in the day, I stopped at the local 7/11 and while I was inside we heard something akin to a a large pig with a huge knife stuck in him.
I ran outside to find a rather large guy standing (hanging) on his tiptoes next to my work van with his armpit firmly attached to the top of the driver door glass that I left rolled down about 8 inches. Attached to his arm was my 118 lb. K9 Doberman.
He told the cops (as they were loading him in the ambulance) that he just wanted to pet the puppy.
I told the cops (which I knew) that the dog does not get off his spot between the seats unless somebody fiddles with the vehicle.
Cops believed me (they knew the dog also) and the guy's rap sheet showed about 6 pages of burglaries.
When he stuck his arm thru the window, the puppy grabbed his wrist and then proceeded to work his way up the arm until he could go no farther. Sorta like when you reel in a fish, pull and take up slack, repeat, etc.

Best anti-theft device I ever had.