WinterBash 2012 is over, and as such, this behavior may change without notice. Should it change, this Question exists as a historical reference.
I was poking around winterba.sh for secret hats and I figured there may be a secret hat linked to a URL so I decided to look at some different URLs and got plenty of 404s but, some pages throw different 404s than others. Why?
(http://winterba.sh/secret used to throw just the text "404" but since that has changed)