Bourne and Marie spend a bunch of time forming a plan to get something, complete with codewords, specific instructions, and all the convoluted twists and turns you'd expect, especially given the layers of conspiracy and spycraft surrounding the series. In practice though she ends up getting what they need just by telling a friendly employee that she's someone's personal assistant. Bourne is left more or less saying "Oh... that's good" as if realizing how sometimes a simple plan works just as well as being Batman. It's one of the only funny scenes in the whole series and despite the fact that it might seem out of place, it does work really well.
In the third movie:
"Sir, he drove off the roof." "What?" "He drove off the roof!"
Also Bourne ringing Vosen from his own office.
Vosen: "I'm in my office."
Bourne: "Oh, I highly doubt that."
Vosen: "Why is that?"
Bourne: "If you were in your office, we'd be having this conversation face-to-face." *hangs up*
Also, Bourne talking Ross into walking next to a guy in a blue hood... who promptly gets nabbed by the CIA. You can see Ross's expression of "What have I gotten myself into...?".
