President Barack Obama put on his tux for his eighth and final White House Correspondents' Dinner Saturday night, the one night a year where the president gets to tell some jokes that show what he (or she, as Obama not-so-subtly predicts will be the case next year) is really thinking. [...] Obama didn't pull any punches, zinging Donald Trump, Hillary Clinton and himself in a set that would pass muster at the Comedy Cellar. Obama saved his sharpest darts for Republican candidate Donald Trump, though, saying things like, there's one area where Donald's experience could be invaluable, and that's closing Guantanamo. Because Trump knows a thing or two about running waterfront properties into the ground.