Haven't had that happen yet, but I'm waiting as I am using my old Jeep plate to advertise the business on the front and my real plate on the back. Waiting for the vanity plates (takes about 45 days) to replace the ones the dealer ordered.
Second day of driving my smart I was entering a tee intersection where traffic had to stop and a guy driving an F250 almost didn't stop while looking at me make the turn. When he realized he was about to hit someone in the intersection he jammed on his brakes, the woman in the Taurus wagon behind him, also looking at the car didn't notice the quick F250 stop. What a surprise to see her gawk and then her body lurch forward as she bumped the truck! No damage and a lot of smiles. This smart just caused its first accident, I expect more occurrences like this as this is the only smart in the area.