A couple things I've witnessed. Not too long ago, I stopped at a Dollar General store (they put these things out in the country to intercept the locals who would normally drive to "town"). You guy...maybe 20ish...pushed a shopping cart from his car up to the front entrance and just gave it a shove, then turned his back and walked away. The sidewalk area had an ever so sligjt slope to it that sloped back toward the parking lot. As simple physics would have it, gravity slowly, but surely turned the cart around and it began to roll back into the parking area. The further it got, the more speed it picked up. It ended up following the guy all the way back past his car...and as soon as he opened his door, the shopping cart knocks the piss out of the car beside his. I could see from where I was at that it put a considerable sized dent in the car. I watched him walk over and look at the damage...get in his car and start to leave. I quickly backed up and pulled in behind him, temporarily blocking him in long enough to snap a pic of his tag. He sees what I'm doing and he jumps out raising hell. I just waived and left to drive around the block. When I pull back around, he's gone...so I go in the store and asked who was driving the car. I little old lady said it was hers. I provided her with the car's description and tag #, the driver's description and what I saw happen. Also gave her MY info in case she needed a statement for her insurance or police report. Never heard another word about it. Long before THAT incident, me and the wife went to see her dad in the hospital. We had parked in the parking deck. While we were walking down, I noticed a minivan attempt to pull into a pretty tight spot between 2 vehicles. The front bumper of the van caught the passenger side rear door of a brand new Dodge Magnum. So, instead of stopping her van to assess the damage, she backed up...doing further damage to the Magnum. She threw it in Drive and drives on up on another level. About a minute later, she comes back down and exits the parking deck. I got her tag # and called the cops. They showed up in less than 5 minutes. The cop called in the tag number and they call back what/who it's registered to. Turns out, not only did I give a bang up description of the driver...I also nailed the color, make, model AND YEAR of the minivan...and also where on it they would see damage. I received a call from the Dodge owner's insurance agent about a week later for a recorded statement of events. He was singing high praises for what I did. Said as far as he knew...the woman went to jail for it.