I remember reading somewhere that adding six slashes at the end of www.google.com changes the way the page look. So, I decided to check on some other sites that I frequently visit and so far have come up with one page. If you put one more slash at the end of yahoo.com ( http://www.yahoo.com// ) the date and time on "in the news" section changes to 6:00pm Wed December 31.
Here is a screenshot(click for a better view):
Got any others ?