If you don't know what it is then take a look here
One way to celebrate is to watch some ration youtube videos and so this give me a good opertunity to mention Pat Condell - you can read about him on Wikipedia here or his website here
He has just brought a DVD out (see here) and I've already sent off for mine although i haven't got mine yet. I can't wait.
To see him in action click here or here or here