The last thing anyone would expect is for the Joker to believe in the supernatural, but apparently Gotham was in luck, because the clown was about to make a deal with the King of all ghosts to revive his prized foe.
Said King was not happy about the request, nor did he care about the clown's feelings, but he knew it was a necessary evil. Or at least, that's what Clockwork told him; of course, Danny didn't intend to do anything for free.
The Joker got his wish, Bruce came back from the dead and Danny wondered what he should do with the clown's soul. With a shrug he decided to put it to the best possible use and wrapped it in a little bow before handing it over to Jason Todd.
Jason thought it was a joke, a cute guy giving him a gift out of nowhere and claiming that the frozen ball in his hand was the Joker's soul? Yeah, right.
However, John Constantine came through Gotham and it became obvious that it wasn't a joke and that the cute guy was more than just a regular guy. It also came with the feature that Bruce returned to the living, which made him strangely relieved.
And fuck, reckless or not, Jason needed to find the guy again and steal the air out of his lungs, because that weird ball was the best gift he'd ever been given in his life and it might as well be an engagement ring.