I heard that, in order to shoot the Walker, Texas Ranger scene, the director had to trick the bear into thinking that the man it was fighting wasn't the real Chuck Norris but rather a stunt double. Because, bears simply refuse to fight Chuck Norris, even in a fake movie fight. Even so, they had to shoot and re-shoot that scene numerous times because fighting a man that the bear believed just looked like Chuck Norris caused it to keep soiling itself.