Dean Winchester: Hey, there. So, Cas, what's, uh, what's the word?
Castiel: Well, Dean, I've been thinking. Monkeys... are so clever, and their sensible in that they leave the skins on the bananas that they eat. Is it really necessary to test cosmetics on them? I mean, how important is lipstick to you, Dean?
Dean Winchester: Not very.
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From: Supernatural