The modern use of the word "That's so random" or "You're so
  random" as in, "I didn't expect that!" is, actually far closer
  to the original meaning of random. I knew you knew the
  difference (after all, you specifically programmed it in!) - yet
  I still couldn't help myself. Funny that I should have a habit
  regarding randomness. I don't know why I find that funny but I
  do. :P (probably because habits are patterned-behavior and
  random is unpredictability :P )?