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):

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Got any others ?