Timer, meanwhile, checks the other parts of his apartment for debris that's accumulated since the last time he checked. He finds four things, three of which go in the to-trade box by the door and the remaining one of which (a tube of toothpaste) is kept for when he runs out of the current one.

Perhaps he doesn't need to bother with any of this with the Joker right there, demonstrably as minty as this toothpaste, but a century's worth of habits and the decent odds that the Joker's going to go home and be with Nathan instead of Timer add up to doing it anyway.