A runaway bull brought filming on the set of new comedy WALK HARD to a halt, when the beast started charging at cast and crew. The animal was trained to charge on cue and then relax but it misheard a handler's commands and went wild. Actress Jenna Fischer explains, "The bull had to run towards the camera, but it jumped over the camera and got loose and started charging the crew. "It had to be contained and they lost a few hours of work that day. Everyone had to hide in the barn."