Question: Right before Bob brings the Joker the pictures of Knox and Vicki Vale, what are the pictures of the creepy smiling guy in the other room supposed to be of, one of which is him lying on top of a coffin?
Bishop73
17th Jul 2022
Batman (1989)
Answer: The Joker had somehow obtained CIA files about DDID nerve gas. The picture is of a dead man, presumably a soldier, killed by the gas. He's not on a coffin though, it looks like sandbags. He's smiling because of the effects of the gas contorted his facial muscles that way, much like how the Joker's Smylex leaves its victims with a big grin.
Answer: The military nerve gas is Symlex, he stole it because it leaves the victims smiling, like him.