In The Dark Knight’s opening scene, one of the bank robbers is doing something to the bank’s silent alarm system and he comments to one of his fellow henchmen: “That’s funny, it didn’t dial out to 911; it was trying to reach a private number.”
My understanding of this is that since the bank was a mob bank, it would not want police to get involved if there were a robbery and hence the “private number” reached by the silent alarm was probably the contact number for some mafia/mobster guys whose job it was to serve as protection or defense of the bank if it came under attack, right?
Some other unrelated questions:
Why was it necessary for the Joker to get personally involved in such a dangerous job where the chances of him getting killed were high? Yes, he’s crazy, but what for?
Also, what bank robbers in their right minds give their victims hand grenades? The victims could just…throw the hand grenades at the robbers while the robbers’ backs are turned.