I am constantly seeing the "Keep Calm and Carry On" image
on the internet, in book shops, on notebook covers, inspirational quote books,
Then, I found this short doco on the origins of this poster.
Created for the Second World War, the poster of five simple words was intended for use in in times of crisis or invasion, but was never distributed. 30 years later, it was found and became one of the most popular posters of our time.
Its worth a watch.