So now the truth can be told? Amid laughing along with Jon Stewart about his recent appearance on Oprah Winfrey's "final" season, David Letterman disclosed the real reason Oprah had been giving him the cold shoulder for years upon years. Turns out she doesn't enjoy "a little horseplay." And by horseplay, he meant a little practical joke he pulled when they were both vacationing on a fancy island and dined at the same fancy restaurant. Or maybe the restaurant wasn't fancy. Sounded fancy, though. You be the judge. Oh, celebrities. They're just like us!