in on the set of Superman Returns, in which the crews  walkie talkies were stolen, forced filming to be halted. Pranksters  caused chaos during a stunt sequence, being filmed in Martin Place,  by shouting "cut" and "action" over the airwaves. The thieves with  the walkie talkies listened in to much of the nights filming to  learn key phrases which they later yelled at key moments. The  mischief almost caused serious injury, with the nights filming  centering on a Mustang car jumping down steps and landing between  extras. It stopped a number of times.