Izzy's, the best corned beef in the world, uses the honor system at their downtown Cincinnati location. There is table service (wait staff, etc.), but you go to a register to pay. There, they ask what you had, did you have cheese, etc.

There is a local radio personality who occasionally pitches in, waiting tables (I'm not sure of the full story). If a table isn't leaving fast enough after finishing eating during the lunch rush, he'll buy their lunch to get them out the door.