My FXT got christened with a big door ding when I had owned it for less than a week. I was getting the car detailed after an encounter with a fallen tree branch hidden by the side of a rural road and the shop owner mentioned they couldn't do much about the ding, and I told him that happened a a few days after I got the car...he said that there will always be a jerk who is resentful of a shiny, new car and do something to it.
My RAV4 got door slammed twice when I was sitting in it at a strip mall...thing was, the van next to me belonged to a guy who was dealing with a maybe 4 year old and baby by himself. The older kid just wouldn't stop messing with the door while dad was putting the baby in its seat, I think he was worried I might beat him up after the second slam and I just told him I understood what small kids were like and moved my car away.
The non-contact parking issue that really gets my goat is when drivers of huge extended-cab, full bed pickups pull in next to me at an angle and effectively block me into my spot because the tail end of their monstrosity sticks out feet past and behind the back of my little SUV. Seems to happen in Dunks lots all the time...I'm sure it's some sort of passive-aggressive compensation thing because the drivers I have caught doing this were nasty old coots or pint sized wimps.
The absolute best was when a coworker got hung up on my RAV4 while backing out and gave me with deep scratches and a flat tire, then drove off. I came out on a tight Friday night schedule to take my daughter to practice and then head up to ski to find that I had to change a flat in the cold and dark...still got it done and went skiing.