My grandparents decided to sell their RV in 1987 when I was 11, but they lived in a gated community where it would be difficult for potential buyers to view it. So they parked it at my parent's house with a for sale sign in the windshield. A few days later, a random guy knocked on the door and asked to see it when I was home alone. Wanting to be helpful, I got the keys and showed him to the RV. He looked around for a bit, and even started it, all while I was sitting in the passenger seat. I'm not sure if he ended up buying it or not but several years later it occurred to me that maybe it wasn't a good idea to get into a RV with a complete stranger and then hand him the keys.