Rob, Gilroy and cray were on death row waiting to go in the electric chair.
Rob was brought forward first. "Do you have anything you want to say?" asked Haggis the executioner, strapping him in. "No," replied Rob. Haggis flicked the switch and nothing happened. Under this particular State's law, if an execution attempt fails, the prisoner is to be released, so Rob was released.
Then Gilroy was brought forward. "Do you have anything you want to say?" "No, just get on with it." Haggis flicked the switch, and again nothing happened, so Gilroy was released.
Then cray was brought forward. "Do you have anything you want to say?" asked Haggis. "Yes," replied cray. "If you swap the red and the blue wires over, you might make this thing work."