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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!'
by Flinders July 18, 2008
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2
Originally a Batman marketing campaign, "why so serious" can be used as a response to someone taking themselves or a particular topic too personally or seriously.
-"Crunchy peanut butter is the ONLY way to go and anyone who eats creamy is a loser."
-"why so serious"
by quasidan2 July 11, 2008
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A quote from the Joker in The Dark Knight, turned in to an internet fad/meme. Usually used on angry, emotional people who tend to go overboard or not understand jokes.
Man: God wtf!!! I hate the world, I want it to burn!
TDK fan: Why so serious?

Troll Topic Creator: Guess what!? I like watching gay men and humping my couch!
Foolish Poster: Wow wtf!? You are fucking messed up man, get some therapy.
Troll Topic Creator: lol, why so serious!?
by ryanxwonbin July 23, 2008
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4
1. Let's put a smile on that face!

2. A response to someone acting serious and/or angry.
1. "Do you wanna know how I got these scars? My father was a drinker, and a fiend. And one night he goes off crazier than usual. Mommy gets the kitchen knife to defend herself. He doesn't like that. Not. One. Bit. So, me watching, he takes the knife to her, laughing while he does it; he turns to me, and he says, 'Why so serious?' He comes at me with the knife, 'Why so serious?' He sticks the blade in my mouth. 'Let's put a smile on that face!' And...Why so serious?"

2. Person 1: "Halo is the best game ever, and everything else sucks! No other game is as good as Halo!"
You: "Why so serious?"
Person 2: "You never do anything right, why do I always have to do things with you!?"
You: "Why so serious?"
by Zes735 August 10, 2008
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5
A famous quote by the Joker from The Dark Knight, the Batman movie starring Christian Bale and the deceased Heath Ledger.
Joker: Why so serious? Hey, would you like to hear how I got these scars?
by Bubba Buckalew July 23, 2008
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6
A very popular tagline for the movie "The Dark Knight". The phrase has achieved a level of popularity, earning it spots as an internet meme, several XBOX Live account names, and something for 13 year olds to put in their signatures on forums to be scary and angsty.

By the year 2018, this will be the new "Where's the Beef?!"
20 Years After the Dark Knight...

Person 1: Remember that dumbass who got "why so serious?" tattooed on his shoulder?

Person 2: Yeah, what a dork.
by gamegenie2k July 25, 2009
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7
The phrase the villain "The Joker" played by Heath Ledger uses in the new Batman movie, "The Dark Knight" when he asks his victims why they are always so serious and not smiling.
The Joker holds a knife up to Rachel Dawes mouth and tells her the story of how he got his scars. He says that one night when his parents were fighting as a young child and he was watching from the corner, his dad asked him "Why so serious?" and used a knife to cut into his cheeks so it looked like he was always smiling.

http://i37.tinypic.com/311q1w8.jpg
by littlefishyjes July 19, 2008
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