Same here. Yu will get your vehicle dented if you park next to people. Its going to happen sooner or later. Some people just don't care or pay attention. My girlfriend used to laugh but now she realizes, and I have also gotten her into the habit of not walking through the center of the car parking spots on the way back to the truck, because even if you can't really see you are walking through some oil. She kinda looked at me funny at first, but I said that we wouldn't walk in our home carpet with oil on our feet.
I was at a club last weekend, when we were leaving and walking through the parking lot, a girl and a guy in a car were backing out, and backed right into a nice BMW, putting a big crack in the bumber. They got out and looked, as people were walking by said to them leave a note on their windshield, but after seeing the damage got back in the car and left. I stopped where I was and bent down to tie my shoe, so when they backed out I could get their lisence plate number, left a note for the guy myself with their info. People, I swear.