An audio tape recording of a conversation between Dr. Hugo Strange and the Joker has surfaced, the Doctor sounds suspicious and the Joker sounds unhinged. Business as usual, then.
Being an audio tape, there's not much to actually see but here it is over some still images of the weird and wonderful inhabitants of Arkham City.
The ArkhamCity site has provided a transcript, too:
Joker: Helllooo anyone in there! No sense of humour... The strong and silent type eh? Think you're safe behind that mask? Give me 20 minutes and a can opener, ill have you whimpering like a school girl. You might like it...
Hugo: That's enough patient, guard leave us.
Guard: Yes sir.
Hugo: Good afternoon, my name is Professor Hugo Strange, and you are?
Joker: Two-face? Catwoman? (laughs) ... Batman!
Hugo: We can play these games as long as you like.
Joker: Great! I love games!
Hugo: Not in my facility you wont, im offering you this oppertunity to make a deal, i am fully aware of your condition the last thing you have is time but i can make your final days more comfortable.
Joker: And in return i would be giving you?
Hugo: I wish to study you I need to know why you are the way you are.
Joker: (Pained voice) I don't have long doc, you're going to need more then some psycho mumbo-jumbo to get to the bottom of what's wrong with me.
Hugo: Oh i have more then that, much more... So do we have a deal?
Thanks, Got Game.