What is it with these keep calm posters anyway?

I need to hold this sign up everytime I'm mad.

I need every single piece of merchandise that has this slogan on it.

I need this shirt.

its from world war 1

Do you not understand that this poster represented staying calm for the British during the war? Wow. Do some research before bitching.

FYI, they were originally made in WWII by the brits to help calm people down during the very often bombing by the Germans