Jeffrey Katzenberg, the Dreamworks genius behind Shrek, is pissed at Warner Bros. for releasing Clash of the Titans one weak after Dreamworks releases How to Train Your Dragon. Here’s the problem – because both films are in 3D, there are only so many theaters that can display the films. That means Katzenberg is out a lot of dough when the theaters make way for Clash of the Titans. To make matters worse, Clash of the Titans was converted to 3D after the film was already shot, which has angered fans. So why convert a film to 3D at the last minute? Because Avatar is making everyone see green, and 3D means more money per ticket.