Same with the sign on a certain airport I visited a number of times as a service engineer: There was a hand full of cash with a stop sign over, obviously it me

Same with the sign on a certain airport I visited a number of times as a service engineer: There was a hand full of cash with a stop sign over, obviously it meant "we do not accept bribes". But for me it meant "this place have or have recently had a serious problems with bribery". Same with: "We do not spit on the floor in this building".