[The Joker's only here because a bald kid told him that he'd be able to find his "props" in this place, but he's honestly surprised at how much stuff there is. It seems like every time he turns a corner, he finds something that he can put to "good" use.
He'll be wandering around the store aimlessly, laughing to himself any time he finds something and imagining what he could use it for before stuffing it into a duffel bag that he found. Even if Jason doesn't recognize the voice (which is entirely possible - alternate universes and all that jazz), the laughter might start to get on his nerves, or he could just happen to see the Joker during the clown's seemingly random travels down the aisles.]
[action]
He'll be wandering around the store aimlessly, laughing to himself any time he finds something and imagining what he could use it for before stuffing it into a duffel bag that he found. Even if Jason doesn't recognize the voice (which is entirely possible - alternate universes and all that jazz), the laughter might start to get on his nerves, or he could just happen to see the Joker during the clown's seemingly random travels down the aisles.]