Anybody who works with classified documents knows that there are cover sheets for those documents which serve (as far as I can tell) two purposes. First, the obvious one of protecting the front page of the document from being exposed 'to the elements.' Also, since they usually have a bright color and fairly bold pattern, they serve as a visual reminder not to leave them just laying around.
What I never knew is that there's more to the classification scheme than just 'Confidential,' 'Secret,' and 'Top Secret.' Much more.
[H/T Jim from work, who got it in email from I know not whom]
ROFLMAO!