Multiple choice general knowledge why so serious Heath ledger Johnny depp Al pacino George clooney Reveal answer Fill a bubble to check yourself A Correct answer Explanation 'Why so serious?' is the Joker's famous line from 'The Dark Knight' (2008), delivered by Heath Ledger in his Oscar-winning performance. This line, along with his pencil trick introduction, became iconic elements of Ledger's portrayal of the Joker.