Movie making is a risky business. It always begins with a financial risk, and sometimes the script calls for necessary, calculated risks to take place on set or location. Stunts, pyrotechnics, firefights: these are just a few things that bring with them an inherent risk when playing big budget make believe. Throughout the history of filmmaking, there have been more than a few tragedies on set. Some have led to abysmal productions, and terrible movies, while others have served as catalyst to funerals. Here are 19 of the worst disasters on movie sets.