The first time one of my sons was driving after driver's ed he and I were going someplace and he told me there was a police officer behind us but didn't have his lights on. I told him to relax that the police officer was just going somewhere. Next thing I know my son is freaking out because the officer had put his flashers on. I told my son to relax and GENTLY pull off to the side of the road. Turns out the plate on the car he was driving (my car) had expired plate by over 6 months. I had blithely driven around for that long never the wiser. Fortunately we just got a warning and the police officer was nice to tell my son that he thought he was doing a wonderful job driving. Needless to say we went back home and got another car to finish our errands.