Batshit crazy (Batman x Joker)
Joker has always given Batman a tough time, he sees it as his duty to keep Batman on his toes through endless torment and torture.
But one day, one day Joker takes things a step too far. One day he finally manages to push Batman over the edge. And on this day, he'll learn that Batman isn't as predictable as he thought he was. On this day, he'll finally stop smiling...
I've taken inspiration from the comics for this story, so that's the versions I will be basing the characters off of.