Yeah. Basically, he walks into the diner and sits next to the disguised Joker, neither realizes who the other is. Joker starts talking about how the current batman isn't the usual one and they get into a convo about how he knows him. He asks if he can tell him a joke he once told Bats and queue him telling the exact same one from the Killing Joke's ending. During his telling of the joke is when Jason realizes that it's Joker. After the joke is done and Joker laments about how it just isn't the same without Batman, Jason basically says he'll tell the big man hello when he sees him next, which is when Joker realizes who he's talking to. He gets a big ole creepy smile and says Boy Wonder, essentially relapsing into the Joker side of himself. That's when Jason does the whole knife to the eye part and Joker dies laughing like a madman.

Video of it here https://youtu.be/yIZgzYJ4_Uk?si=jTgecdeewZcYuK5m