Lordy, Splinter Cell quotes? There are just so many good ones, just from Chaos Theory.
Anna: The Maria Narcissa.
Fisher: Sounds like your setting me up for another blind date.
Anna: The Maria Narcissa is a boat.
Fisher: So was the last girl you set me up with.
Anna: Fisher!
Fisher: Sorry.
Fisher: Bad news.
Guard: Agh! I knew it! I knew there were ninjas around here!
Fisher: What?
Guard: Yeah, you've gotta be a ninja. How else could you sneak up and grab me like that?
Fisher: Listen, I don't know what...
Guard: Wow! A real, live, ninja! I can't believe it!
Fisher: Listen, I'm going to kill you if...
Guard: *Wow*! Killed by a ninja... cool!
Fisher: You weren't working for government during the Gulf War?
Anna: No. I was in tenth grade.
Fisher: Oh. Right. Yuck.
Lambert: Looks like there's an active alarm system...
Fisher: Let me guess - three alarms and it's over?
Lambert: Of course not! This is no video game, Fisher.
The list goes on and on.