I’m sure that you’ve all seen this image, right?

It seems to be all over the internet in many different forms – different colours, different slogans, etc. as the following gallery of just a few that Google Images turned up will attest to:
One of my personal favourites carries pretty much the exact opposite message:

The Chive, a hugely popular photo gallery site has made its slogan “Keep Calm and Chive On”, along with printing very-hard-to-get-before-they-sell-out-each-time shirts with the slogan printed on them. An example:

Of course mine is still somewhere in the postal system. Or at least that’s what I keep telling myself when the shirt keeps failing to arrive in my post box…
Well, for those of a historical bent, here is a pretty interesting 3 minute clip on the story behind the famous original poster. Take a look:
Consider yourselves educated.