The Dark Knight – Joker quotes. The Joker: I believe whatever doesn't kill you simply makes you stranger. [stumbles out of wrecked truck] The Joker: [to. 12 quotes from The Joker - Heath Ledger: 'Smile, because it confuses people. Smile, because it's easier Joker - Heath Ledger. tags: batman- the-dark - knight. The Dark Knight () Quotes on IMDb: Memorable quotes and exchanges from movies, TV series The Joker: If you're good at something, never do it for free.