Topless Robot did a good summary on how ridiculous some of the "mysteries" were:
http://www.toplessrobot.com/2009/07/the_10_most_ridiculously...
http://www.toplessrobot.com/2009/07/the_10_most_ridiculously...
(On a side note, I have seen IIII in the 4-spot on clocks, but only in a few places in San Francisco.)