This poster originated by the British Government in 1939 just before the start of World War II to calm the fears of the public in the case of an invasion. The posters were distributed all over the country of England. There are only two original copies left to day. But in the yr 2000 the phrase resurfaced and has become a
catch phrase in the U.S., Keep Calm and.... add your own ending.
My favorite is...
even one for the Holidays!
it's hard to beat the original for any ocassion.