Across whole show

Greg Sanders: For the record, I really like having a penis.

Greg Sanders: I'm like a sponge: I just absorb information.

Gil Grissom: I thought that was my line.

Greg Sanders: I know - I absorbed it.

Lucky Strike (series 3)

Nick Stokes: There's a sucker born every minute.

Gil Grissom: Yep, and they all come to Vegas.

Across whole show

Gil Grissom: Concentrate on what cannot lie - the evidence.

Pilot (series 1)

[To a room full of dead corpses, after Holly Gribbs was frightended into hysterics]

Gil Grissom: You assholes!