Batman: Arkham Asylum

The situation at city hall took place at exactly the same time as a 'mysterious fire' broke out at Blackgate Penitentiary, causing many of the prisoners to be sent to Arkham, among them a great number of Joker's own gang. When the two arrive at Arkham, Batman and several helmeted security guards strap the Joker to an up-right stretcher and wheel him down into the Intensive Treatment Center. Sensing something is wrong because Joker seemed to give up easier than usual, Batman accompanies the security personnel and the Joker to the Holding Cells, where the Arkham staff refuse to let Batman go any further.