10 Movie Villains That Killed Other Villains
3. The Joker Killed Lau - The Dark Knight
It was a harrowing delivery when Alfred Pennyworth told Bruce Wayne that some men just want to watch the world burn. He was, of course, referring to the chaos that the Joker was illiciting, but this wasn't all the Clown Prince of Crime wanted to burn.
Towards the beginning of The Dark Knight, the Joker attempted to negotiate a 50% fee of all the combined money of Gotham's organised crime syndicate to kill Batman. It was a while before he was hired, and with all of the physical dollar bills being brought together by Lau, the next step was simple.
Lau, essentially the accountant for the villainous group, who had earned a living outside of the law with his aptitude for calculations, was sat atop the big pile of cash strapped to a chair. He had no way of escaping when the Joker set fire to his half.
The murder of Lau may have been just because the Joker liked chaos, and wanted to watch the world burn like Alfred said, or maybe it was more meaningful than that. He said himself it wasn't about the money, it was about sending a message, and what better way to prove it than by killing the accountant?