In Splinter Cell: Chaos Theory, there's a funny ass dialogue if you grab a specific guard in a specific level (don't remember which).
Sam Fisher: Bad news.
Guard: I knew there were ninjas around here!
Sam: What?
Guard: Yeah you gotta be a ninja. How else could you sneak up and grab me like that?
Sam: Listen, I don't know what...
Guard: Wow! A real, live, ninja! I can't believe it!
Sam: Listen, I'm going to kill you if...
Guard: Wow, killed by a ninja... cool!
Sam didn't get any info from that guy.