Sam, Dean and others in “Unfinished Business”

Sam

Joe White Tree? [the man nods] We'd like to ask you a few questions, if that's all right.

Dean

We're students from the university.

No, you're not. You're lying.

Dean

[seems taken aback] Um, well, truth is—

You know who starts sentence with "truth is"? Liars. [Dean exchanges a look with Sam]

Sam

Have you heard of Oasis Plains? It's a housing development near the Atoka Valley.

[to Dean] I like him. He's not a liar.