If you are clueless about the “Keep Calm and Carry On” posters, here is a little history lesson. In 1939 during the beginning of the Second World War, the British government produced the Keep Calm and Carry On propaganda poster. The sole purpose was to raise the morale of the British public in the event of invasion. Seeing only a limited distribution supply, it was barely known by the general public. The poster was rediscovered in 2000 and has been re-issued by a number of private sector companies, and used as the decorative theme for a range of other products. There are only two known surviving examples of the poster outside government archives.
Original 1939 poster.
It inspired various versions, printed on baby clothes, mugs, etc. as recently seen in London. A change of spirit.
Here are a few other applications, born in the mind of publicists.
And my preference goes to: