My worst horror story is my father. Growing up he said to never used car washes that have brushes. In fact, I don't take my cars to ANY car wash save for the Escape which I don't really care about. However, I refuse to use any brush on it's paint.
Well, for some reason in the past few years he always takes his four cars to the car wash. Won't wash them by hand anymore. Maybe it's because he's lazy or just getting up there in age. Fine, fair enough. Then one day I'm over and I see horrible scratches all over the Jeep which is a dark green. I asked what happened to the Jeep and they looked at me funny. Later I found out that he goes to the car wash and uses the WHEEL brush on the paint!!!! He justifies that he cleans out the brake dust first.
I asked him if he was senile. You can see the marks on all the cars now. The other three are silver. What a shame.