Beware of limbo dancers

Sign on the inside of a bathroom stall: “Beware of limbo dancers.”
A hardware store in Oregon has a sign that reads: “Today’s special.”
Below, it says: “So’s tomorrow.”
Sign in school: “In case of atomic attack, the federal ruling concerning prayer in this building will be temporarily suspended.”
Sign seen on an electricity pylon: “DANGER! To touch these wires will result in instant death. Anyone found doing so will be severely prosecuted.”
Sign at a garage in Hertfordshire: “Please do not smoke near the pumps. If your life isn’t worth anything, gas is!”
Sign seen in the vicinity of Victoria Station: “Closed for official opening.”