Batman and Nightwing teaming up to kick Amazo's ass.
Joker killing one of Black Mask's goons with a broken glass and using that goon's gun to kill the others in seconds while still being incarcerated is both cool and scary at the same time.
The viciousness and psychosis he shows in that scene proves beyond reasonable doubt he could take a run at HeathLedger.
Bruce laying the smack down on Jason. Then later dodging a bullet with his back turned and precisely throwing a miniature batarang into the barrel of Jason's gun before he lets out the next bullet therefore making the gun explode. Even the Joker was in amazement over it.
Batman leaping through a car being thrown at him by the bigger Fearsome Hand member, landing on the guy, and dropping a miniature device that sends him flying a few blocks away.