These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Joker: "Well I can't believe he didn't die the first time he dressed up as a giant bat and jumped off the roof."
Nightmare Fuel: Alfred's eulogy where he reveals himself to be The Joker. That's right. The villain who crippled, stripped and possibly molested Barbara Gordon, beat up Jason Todd with a crowbar and blew him up before luring a young psychiatrist into a life of violence and cruelty was just Bruce's butler playing a part.