Movie stuntmaking is a big business,an integral part of today's film industry stuntmen and stuntwomen crash motorcycles,cars,and planes.They jump off tall buildings or from helicopter,ski off cliffs,set themselves on fire,and swim with sharks.Early stunt were never perplanned.A stuntperson just went out and did whatever had to be done,often suffering injury or even death.Today,however,stunts are planned and sefety is arranged.Safety percautions for a human-torch stunt,for example,include the use of asbestos fire suits and nonflammable plastic masks.