The Only Reason Damian Doesn't Have A Problem With Danny Is That Danny Is Technically Now His Nephew - Tumblr Posts
The Jokes of the Ghost:
While de-aged, Danny stumbles into the Joker's hideout. Nothing special; it's a Clown. Well, Danny can prank him! The spirits around him all told him what they wanted to do to this clown. But no death, they don't want his ghost near Gotham, but very far away.
So Danny was causing harm with playful ghostly antics that turned the Joker's plans into comedy. Danny played pranks on the poor Joker for already one month. The Joker can't even leave the room without getting a bowling ball in his balls or a stumple to fall on his face. The money he stole is gone, the food he eats is rotten, or worse, his car is frozen solid, or his weapons are fake guns.
Much to the amusement of Gotham.
Then, one day, an angry joker and the police see who gave him all the problems. It was a meta! Dressed in a Bat Onesie.