My husband's late grandfather owned his own restaurant supply business before he retired. He learned over the years that you could pretty much tell what a restaurant's kitchen would look like based on how the bathrooms were kept. If the bathrooms were immaculate, you could count on a kitchen with the same level of hygeine. If the bathrooms were dirty, however, you could expect to find the same conditions in the kitchen.
Has anyone else noticed this? Or any other rules of thumb about restaurants?