What separates Marvel movies from those made around DC Comics characters? Jokes, for one thing. It's intentional: "The worlds of DC are very different," Warner Bros. chairman and CEO Kevin Tsujihara recently said. "They're steeped in realism, and they're a little bit edgier than Marvel's movies." True, but they don't have Robert Downey Jr. being a smart aleck, and sometimes that's all you want. "Actually, he's the boss," Downey-as-Tony Stark says about Captain America in a new and funny trailer for "Avengers: Age of Ultron." "I just pay for everything." ZING! The movie is out May 1.