This was posted to one of my writing forums and I thought it was hilarious, especially to anyone who spends a lot of time on message boards:
http://projectboil.pixel10.co.uk/posting/Posting.html
It uses Flash.
John
Brilliant 
This should be in all the FAQs!
This one’s making the rounds – just got it from a work mate. Brilliant.
And to think: I was going to start another thread just to say this!!
*G