NCIS Season 8 Episode 21

(In Gibbs' basement)
Tony: Hey. What you working on?
Gibbs: Wood. (Tony places two glasses down on a workbench) What's the occasion?
Tony: I thought we could talk?
Gibbs: So talk.
Tony: You know I look up to you, Boss. Learned a lot from you over the last... ten years. You've been a great teacher.
Gibbs: You gotta point, DiNozzo?
Tony: ...I've always though that the headslaps were, er...a sign of affection. Today in the squad room, I was expecting one, and I didn't... I didn't get it... Are you pissed at me?
Gibbs: Rule number twelve.
Tony: Never date a co-worker. Yeah... I know. She's pretty great, though. EJ and I have a lot in common. She's easy to be with, you know. It's nice to have somebody to talk to. NCIS doesn't have any... policy against it, you know. There are married agents. And technically, EJ and I, we don't work together, we're on separate teams.
Gibbs: My team. My rules.