this is still relevant
This poster became really (re)popular a few years ago. Originally, it was a WWII poster plastered in England to inspire comfort during a time of world unrest. Today, you can buy it in a post card, mouse pad or tee-shirt form. I love it.

I also like this incarnation:

And I can see the humor in this one:

May 6, 2009 at 9:19 pm
We’re making a charm at work now that has “keep calm” on one side, and “carry on” on the other! I guess everyone’s a nervous wreck!