John Stamos is on an endorsement spree. First he unleashed the John Stamos Guide To Cuddling to the world, and now he's endorsing a new brand of Dannon yogurt. We think we know the ad company's thought process: Who's a good-looking celebrity who's also known for being Greek? How about that Jesse Katsopolis character? Oh, that's not a real person? Just a guy on 'Full House?' Let's get that guy, anyway. Not that we're complaining, of course.