YouTube founder Steve Chen, on the Oprah show, recites the same old tale he and Chad Hurley have been trained to give about how YouTube got his start: Chen threw a dinner party, friends filmed each other with videocameras, and then realized the videos were hard to share. What the two didn't tell Oprah: YouTube's third cofounder, Jawed Karim, claims the dinner party never happened, and he came up with the idea for a video-sharing site.