The Joker notices that Xel looks happy, and relieved, at the knives. He chuckles inwardly. No doubt he was thinking of the toxin. But no, any of his mixes were his alone...though he HAD thought about selling the water-spraying fake flowers and filling them with the Joker Juice...
"So...do you have any way to tell if the laughing buggies and the benches are having an effect at all?" The Joker removes the sock puppets and sets them back in the trunk.