The lovely Arkham Asylum Wing D, 8 pm.
The Joker woke up as 2 heavily armed guards entered his cell.
"Up!", barked one of the guards, pointing his rifle towards the villain.
The Joker sighed and got up at an agitating slow pace.
"Face the wall! Put your hands on it!"
Joker did so and heard something getting wheeled in.
"Turn around! Meet your new roommate."
The Joker turned around and saw a big, grey iron box placed in the corner. Its inscription read;
"No 4207
Pennywise".
The box only had one window, just a few inches big, which was dark.
The Joker was intrigued.
"Pennywise... Sounds charming. Not the least worry of claustrophobia , eh?"
He turned to the guards; "Doesn't the boy get any airtime?"
"That box is impossible to get open so save it. And no, if He gets out, you're pretty much fucked.", replied the guard in a stern voice.
The guards left and the Joker examined the box from head to toe. The guard was right as the Joker found not a single spot to crack it open. Then the Joker jiggled the box a bit but not a single reaction could be seen or heard. Eventually, he got tired of it.
"You must have been a real naughty boy my friend. Ha...sweet dreams iron man!" and the Joker went to sleep. He started up in the middle of the night because he heard something what sounded like music. The Joker got up and saw white light coming out of the little window of the box. Joker went in for a closer look and peered inside. He only saw some white light at the bottom and balloons. Lots of balloons, in all the colors of the rainbow. Nothing else could be made out and the whole spectacle was accompanied by merry carnival music. Then a white flash seared his eyes and he fell on his back, screaming and writhing in pain as Pennywise took possession of him. The Joker felt a cold and deep darkness invading him which was infinitely more worse then his own personal madness but this New Dark was so...VORACIOUS! The Joker kept wailing as if something was sucking his blood out and replacing it with hot, molten lead. The Joker's eyes went black and he became silent. Pennywise had filled him with His Deadlights but some part of the Joker remained. The sadistic part.