CSI: Crime Scene Investigation, Season 1

'Catherine:
(alarmed) What are you doing?

Grissom:
Bones are porous. They stick to the tongue (puts piece in mouth again) and this doesn't stick. (puts it back down) It's a piece of rock.

Catherine:
I-I hope you had your hepatitis B shot. (Grissom gets up and starts searching for more bones, Catherine follows) Did you? (Cuts to Grissom and Catherine walking toward a cadet, who may have found a piece of bone)

Grissom:
Could be a piece of wrist bone.

Catherine:
Well, do you want to suck on it? To be sure?