I got a classic movie for Christmas:
I was pretty excited for the movie in and of itself, and then my mom blew my mind by flipping the case over.
My mom claims to have bought the movie solely because of the packaging design.
Then I stumbled across this online:
Which naturally got me interested in this graphical oddity.
Of course, wikipedia has an entry with all the details, history, trivia, and references to fill your hearts desire.