Today's Katie Couric has nabbed what NBC is calling an "exclusive" interview with O.J. Simpson for tonight's Dateline NBC. That's odd, because I could have sworn Fox News Channel's Greta Van Susteren just scored her own O.J. sit-down, during which the Naked Gun star teased his straight-to-DVD prank show, Juiced. "It's a takeoff on something called Punk'd," he said. "It's me... 'juicing' people." And then denying it.