This made me laugh, courtesy wikipedia

n June, 2007, a Wienermobile with the Wisconsin license plate of YUMMY made headlines after having been stopped by an Arizona Department of Public Safety officer for having an alleged stolen license plate. Officer K. Lankow had observed the Wienermobile slowing traffic and checked the license plate number to determine if the vehicle was street legal. The license plate came back as being stolen out of Columbia, Missouri[2], so the officer stopped the Wienermobile and detained the driver. The Columbia Police Department, that had flagged the license plate as being stolen, had neglected to add that it should be considered stolen only if not on a Wienermobile