What was your first RV noob disaster (or near disaster)?

When I first picked up my RV I took it to an KOA park and while driving down the highway I saw a police car with it's lights on in my rear view mirror come up behind me. I looked over to the passenger seat and to my horror saw my license plates on the seat. Fortunately, the police car went by me but I was kicking myself for doing something so dumb.