Keep Calm-o-matic

Thanks to Noel Jenkins for the tip-off to a cool tool for school...

You know those KEEP CALM and CARRY ON things that are everywhere ?
Well now you can create your own versions with the KEEP CALM O MATIC
And thanks to a link with Zazzle you can then get your creation made into a t-shirt, mug, tie etc...

You don't have to be calm of course, as Tony Cassidy has just reminded me....

How about:
The thoughts of geographical features
Revision hints etc.

Any other ideas for its use in the classroom ??