Ever since I saw him take off his Arkham Knight helmet. I instantly noticed something strange..
THE GIANT JOKER BRAND ON HIS FRIGGEN FACE!
And it also gave me a thought.. "where have I seen this before"
The 'J' tattoo under the exact same eye. Not saying that these are legitimately connected, but I think it's an interesting coincidence to think about.
What if joker got this tattoo to not insinuate the J for Joker, but J for Jason Todd. A commemorative tattoo after his death, a reminder that Jason was his little bitch for a few hours before he died. A tattoo that probably engages batman every time he looks at the joker's face, knowing it's the last face Jason ever saw.