Japan is the land of  the strange signs.  In a public pool  you will often see a sign that says "No people with tattoos can swim here ! " (In Japan the vast majority of people with tattoos are members of the Japanese mafia...) Until a few years ago you could often see signs at nightclubs and bars that said  in English "No foreigners allowed !" The sign in the above photo says: " On a windy day , watch out for falling branches ! " I am expecting anytime now to see a sign that says : " In the event of an earthquake , watch out for falling buildings. " Or maybe.... "In the event of a thunderstorm watch out for dangerous lightning bolts ! "