Happy 51st Birthday, Sean Penn! What's His Best Movie Line?

It seems like Sean Penn schedules his birthday the day after Madonna's almost every single year, which shows his true character. But let this not be a day of judgment! The 51-year-old thesp is the pride of Gen X's acting pool, and with good reason: The two-time Oscar winner is a commanding presence, a distinct powerhouse, and a whiz with punchy dialogue. What's his best line in a movie?

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