This line is probably going down in history as the most famous
and memorable quote from the new Batman movie 'The Dark Knight'.
Spoken by the late Heath Ledger as The Joker.
The tagline was also used in the production company's marketing campaign for the movie.
In every day use it can be used to tell someone to lighten up.
The Joker: 'Why so serious? Let's put a smile on that face!'
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