Will Johnny Depp and his cohorts in Public Enemies be able to shoot down the rampaging Transformers Revenge of the Fallen over the July 4 holiday? The film, along with Fox's 3D cartoon Ice Age Dawn of the Dinosaurs, opens in theaters today (Wednesday), and it's anybody's guess which one will produce the most fireworks. Transformers may have been a $200-million wonder last weekend, but ticket sales fell off far more steeply on Sunday than the studio had expected. By this weekend it could reach the point of audience saturation. At the same time, Johnny Depp is no stranger to box-office treasure troves. His Pirates Of The Caribbean Dead Man's Chest is the third-highest-grossing film of all time (behind Titanic and The Lord Of The Rings The Return of the King ), and his Pirates of the Caribbean At World's End is the sixth highest-grossing film. Moreover, no one is willing to call Ice Age 3 out at this point either, despite mixed reviews. Ice Age The Meltdown , after all, grossed $651.9 million worldwide.