In a similar vein, I am amused by signs I have seen which I classify as "I know what you mean but that is not what you said."
For example:
On a highway the sign read, "BE PREPARD TO STOP" as if there is a time when we need not be prepared to stop?
At the entrance to a two lane car wash, "USE BOTH LANES." Now, I can use EITHER lane but not both lanes.
In an office building, "FIRE DOOR. ALWAYS KEEP CLOSED." If it were always to be kept closed, why have a door? What they really mean is "do not leave open."
Anyone seen similar things?