Gentleman at Party

This man attended the fundraising party for Harvey Dent held at Bruce Wayne's penthouse.

When the Joker approached him, the man definatly stood up to him. The Joker was angered by his show of defiance and stuck a knife to his mouth, much as he had done to Gambol. The Joker informed the newly intimidated man "You remind me of my father. I hate my father."

Behind the scenes

 * Credited as 'Unintimidated Gentleman at Party'.
 * This man was played by Patrick Leahy, why had previously played himself in Batman & Robin. It is unclear if he played played himself in The Dark Knight as well.
 * The Joker's reference to hating his father further corroborates his alleged anecdote to Gambol.