Nick: Look. Grissom I know this is a bad time to bitch to the boss but, uh, I've been a CSI Level 3 for nine months now. I was a CSI before Warrick. Warrick works D.B.'S solo. Why can't I?
Grissom: Repeat after me. Silk, silk, silk.
Nick: 'Silk, silk, silk'?
Grissom: And what do cows drink?
Grissom: Cows drink water. They produce milk. A simple riddle. Common sense disguised in a puzzle of words, but an excellent barometer for evaluating someone's readiness.
Nick: Look, I'm not one of your suspects you can trick, okay? If I'm not ready, be a man -- tell me I'm not ready.
Grissom: You're not ready.
Nick: You know why I took this job? Honestly? I wanted to pack heat, walk under the yellow tape, be the man ... but mostly, because I want you to think I'm a good CSI.
Grissom: And that's the reason I have to hold you back. Anybody who's great at anything, Nick, does it for their own approval not someone else's.