After 7 hours
Joker: "And stop!"
Batman immediately stops singing and offers a sinister growl.
Joker: "Have I made my point my little henchman?"
Batman: "I get it. What's your plan?"
Joker: "Lots of fun with you! And resist it all you want, your new chemistry has you designed to be obsessed with FUN! You're going to love doing what I want, but still resist it because you're Batman. But you'll do it because you can't say no!"