Actual signs

In an office:
WOULD THE PERSON WHO TOOK THE STEP LADDER YESTERDAY
PLEASE BRING IT BACK OR FURTHER STEPS WILL BE TAKEN

Outside a farm:
HORSE MANURE
50p PER PRE-PACKED BAG
20p DO-IT-YOURSELF

In an office:
AFTER TEA BREAK STAFF SHOULD EMPTY THE TEAPOT
AND STAND UPSIDE DOWN ON THE DRAINING BOARD

Outside a secondhand shop:
WE EXCHANGE ANYTHING - BICYCLES, WASHING MACHINES ETC.
WHY NOT BRING YOUR WIFE ALONG AND GET A WONDERFUL BARGAIN?

Sign outside a new town hall which was to be opened by the Prince of Wales:
THE TOWN HALL IS CLOSED UNTIL OPENING.
IT WILL REMAIN CLOSED AFTER BEING OPENED...
OPEN TOMORROW.

Outside a photographer's studio:
OUT TO LUNCH:
IF NOT BACK BY FIVE, OUT FOR DINNER ALSO