User blog comment:DragonDude83/PE Proposal: Joker (The Batman)/@comment-27059900-20200221004256/@comment-30757877-20200221040153

Well, in the three occasions where the Joker's accident was depicted or referenced, the Joker just mentions that he fell into the chemicals and that was enough to corrupt him. Unlike his The Killing Joke incarnation, there's no mention of in what circumstances he was at the factory or even if he was coerced to rob the factory like in the comic, where Vinnie & Joe forced him to do it despite his reluctance