Les quatre cents coups (The 400 blows) (1959)

Psychiatrist: Your parents say you're always lying.
Antoine Doinel: Oh, I lie now and then, I suppose. Sometimes I'd tell them the truth and they still wouldn't believe me, so I prefer to lie.

Shallow grave (1994)

David Stephens: Take trust, for instance, or friendship. These are the important things in life, These are the things that matter, that help you on your way. If you can't trust friends, well what then? What then?