At the start of the dark knight he`s doing a bank robbery with what assumed to be very well experienced bank robbers he`s stealing from the diffrent crime syndicates of gotham at their central bank ; then he kills the bank robbers as well as the criminal goons . His attack on the bank prompts lau to work with the criminal organizations in hiding their money which The Joker does predict , since he shows up at the same meeting and immedately assumes lau to be a snitch which in time , he ends up being