It's going to be close: Preliminary box-office estimates for the July Fourth weekend show that Transformers: Revenge of the Fallen and Ice Age: Dawn of the Dinosaurs are tied for the top spot, with and estimated $42.5 million in domestic ticket sales each, the Associated Press reported. Whether that tie will remain on Monday, when final figures are reported, remains to be seen. Johnny Depp and Christian Bale's gangster epic Public Enemies, meanwhile, debuted in third place, with $26.2 million.