Castle, Season 4

Kate:
This is the weirdest spending spree I have ever seen. Odette spent tens of thousands of dollars on clothes but nothing in her size according to these receipts. Everything's in size four.

(Castle arrives and puts a coffee down on Kate's desk. She notices and smiles up at him.)

Esposito:
And I went through her apartment. I didn't see a hundred grand worth of new clothes. Maybe she hid 'em.

Castle:
Sounds to me like the old gas card scheme.

Kate:
What do you mean?

Castle:
Your parents put you on a strict allowance, but they give you a gas card so you can fill your car. You fill your friend's cars and they give you cash. Some of my buddies in boarding school nearly doubled their allowance.

Kate:
Uh huh.

Castle:
Not me, of course. (Kate just looks at him.) That... (Esposito gives him a look.) Don't tell my mother.