About three years ago...
We had just completed the installation of a new engine in our 1986 T-Type. We had spent a bunch of money on good parts and we were happy to have the car running again.
We took our maiden voyage from our home (at the time) near Chattanooga, TN to Atlanta, GA for a convention for my wife's work. The fancy hotel where we stayed had no room left in their parking garage when we arrived

, so we were referred to the multi-level parking garage across the street. There were many nice cars in the garage with us (BMW's, Benz's, etc) so we felt fairly safe leaving the car there over night. As a precaution, I disabled the car's fuel pump before we locked it up.
The next morning we returned to the car to find the driver's door left open and the door lock punched out and dangling. The column had been shattered, and the stereo, HVAC controls and dash bezel were destroyed. The fuxx had also punched out the truck lock but failed to get the trunk open (amateurs), which was fortunate because we had a nice amp mounted back there.
Needless to say, we were very distraught. We also found it very suspicious that our old T-Type was targeted when there was much more valuable iron parked alongside. The Atlanta police took forever to show up and were extremely uncooperative, as were the parking garage owners. The police acted as if we were hassling them to fill out a freakin' report.
After some finagling, we were able to get the car started to complete our trip. Words can't describe the anger you feel after some piece-of-chit punk breaks into YOUR car and tries to steal it.

We're so grateful that we thought to disable the car before we left it that nite, otherwise it surely would have been gone.
Many years ago I lived with my parents on Long Island. I came home one night at about 11 PM and parked my LT-1 four-speed Monte SS in front of the house. Thirty minutes later the car was gone and was never recovered. I searched every nook and cranny of Long Island for that car and found nothing, not even a lug nut.
About a year later my 454-powered '78 Malibu was stolen from the driveway. The car was fully disabled and must have been towed. I had no theft coverage on that car, and that sucked. Months later, thieves attempted to steal my Dad's Mustang LX, but were thwarted by a well-hidden $4 kill switch. But that was enough...We all left NY and never looked back. You'd think we lived in the ghetto with all this theft, but the neighborhood was quiet and well-kept. I got the feeling the thieves knew we kept some interesting cars and would stop by every so often to help themselves.
We won't leave our cars anywhere, now. And I have so much anger towards these thieving punks that I worry about what I might do if I catch one.