Got an odd question. Recently purchased a copy of The Dark Knight on a clearance sale. Everything played fine until one portion where the sound dropped out for 20-30 seconds. When the Joker escapes from GPD, there is a shot of him in a speeding police car with his head out the window like a dog. Is there any sound over this shot? My copy has no sound there or at the start of the following shot. It's been a while since I watched the movie and I can't honestly remember. I would think there'd be some kind of sound but don't know for sure. Any help would be greatly appreciated before I try replacing the disk. Ta.