This idea, on the other hand, afterwards turn into inspiration for Joker's hallucination that haunted Batman in Batman: Arkham Knight video game, though how the apparition started to manifest was various, as the game's Joker makes use of his contaminated blood to Batman, activated by Scarecrow's fear toxin, and a http://andersonbiovc.theobloggers.com/11814456/indicators-on-joker-you-should-know