Trivia: To prepare for his role as the Joker, Heath Ledger lived alone in a hotel room for a month, formulating the character's psychology, posture and voice (the last one he found most difficult to do). He started a diary, in which he wrote the Joker's thoughts and feelings to guide himself during his performance. He was also given Alan Moore's comic "Batman: The Killing Joke" and "Arkham Asylum: A Serious House on Serious Earth" to read. Ledger also took inspiration from Alex in A Clockwork Orange (1971) and Sid Vicious.
Question: Just how does Batman's grapple gun work? In Batman Begins, Fox says, 'It's magnetic' so I assume it can attach to anything metal. But the magnet would have to be extremely strong to support the weight of Batman, which begs the question how does it then detach from what he's fired it on? Also, where does he keep all the wire for it, and how does it have the magic ability to wrap its self around the Joker's ankle, when he's been thrown off the building and Batman shoots it at him?
Question: How did the bomb at MCU leave everyone else totally incapacitated, while the Joker was completely unharmed? I know he has remarkable tolerance for pain, but come on! Also, if he was wearing some kind of protective clothing, they would have discovered it. So how did all the cops get knocked out while the Joker just walked away?