"We ran into Paul [Thomas Anderson] once while we were shooting,'' says Ethan Coen. ''When we were shooting a scene with Josh Brolin tracking a blood trail, we had one very wide shot of Josh in the frame. He was just walking in this most remote place in the United States, and then behind Josh [arose] this big plume of black smoke over the ridge. We thought, Son of a bitch, the scene is ruined. We sent a grip over to see what was happening. It turned out it was Paul, testing an oil-well fire. We had to wait for the smoke to dissipate."