Joker - Last Laugh #2 : Siege Mentality (DC Comics)
A riot in the Slab has led to total chaos. The Joker has taken control of the joint, and Black Canary's the lone hero trapped within its impregnable walls. Batman and Nightwing enter the fray, but the Joker's ready for them. It's the end of The Slab as you know it — it's only a question of who will go down with the ship.
Batman Comic
The Joker