The relaxed relationship Catherine has with Grissom is very refreshing considering he is often socially awkward with other members of the CSI team. A lot of this has to do with how long they have known each other. It is easier for him make jokes with her.
Catherine: I realized we have a very healthy relationship.
Quotes provided by Wet Paint.
Grissom: We do?
Catherine: Well, when we get into a fight I don't paint Greg Sanders in liquid latex and stick a straw up his nose.
Grissom: Good. He'd probably like it.
