Ria: You never told me about the eyebrow plucking thing. Where did you read about that?
Cal: Nowhere.
Ria: Why not?
Cal: Because it's complete crap.

Cal: 94th percentile. What did she do differently?
Ria: I can tell you one thing. She got murdered the day before she took the test.

Cal: (to Ria) Oh look, now you're embarrassed. Well you have every reason to be. You did get it wrong didn't you? Sergeant Scott didn't rape Sheila Lake.
Gillian: Cal!
Cal: She's the one making snide remarks. Look at her face.
Ria: How do people work here?

Ria: You drugged her so she could lie?
Cal: Never let the facts get in the way of the truth.

Eli Loker: I would like to sleep with you.
Dr. Cal Lightman: Ah, Eli Loker, Ria Torres. He's harmless, just always speak the truth about what's on his mind. What do you call it again?
Eli Loker: Radical honesty.

Gillian: You think I'm naive just because I don't share your twisted view of the world.
Cal: That and you read romance novels.
Gillian: Yes I do, because they make me happy. A pursuit I highly recommend to you.
Cal: Truth or happiness, never both.

Cal: What's your content analysis of the mother?
Gillian: She was definitely concealing something. When I asked her about Miss McCartney, she started referring to her as 'that woman'.
Cal: As in, 'I did not have sexual relations with that woman, Miss Lewinsky'

The only way three people can keep a secret is if two of them are dead

Gillian: Do you still have that note, that I brought you? I want it for my office.
Cal: (handing over the note) You really are a pack rat.
Gillian: You could have just told me what this was for.
Cal: No. You're a terrible liar.
Gillian: Normal people think that's a good thing.

Lie to Me Quotes

Weil: You haven't done enough muck-raking for one day?
Ria: Sir. We don't think you were doing anything sexual at that club, because, I believe this escort, Melissa, who you paid for time with-
Weil: What about her?
Ria: She's your daughter.

Gillian: Do you still have that note, that I brought you? I want it for my office.
Cal: (handing over the note) You really are a pack rat.
Gillian: You could have just told me what this was for.
Cal: No. You're a terrible liar.
Gillian: Normal people think that's a good thing.