So he just imagined visiting little Bruce and Alfred. And there was never a Bruce Wayne? Thomas never told him to stay away from his son? Thomas was never around 50 years old? So you’d have to say the entire movie didn’t really happen, and the final scene is the Joker in Arkham Asylum in a different decade. I’m actually cool with that. Either he made it up as a good story to tell, and that’s why he’s laughing at the end “what’s so funny?...You wouldn’t get it”. Or he’s so delusional that he believes that to be his origin story. But I like the “if i’m going to have a back story, I prefer it to be multiple choice” aspect of the character. So the first option would be better for me.