What's Our Vector, Victor?

You know that when the first lesson in Linear Algebra on your online course quotes this clip (below, in bold), it's going to be worth it.

Roger: Flight 2-0-9'er, you are cleared for take-off.
Cpt. Oveur: Roger!
Roger: Huh?
Tower voice: L.A. departure frequency, 123 point 9'er.
Cpt. Oveur: Roger!
Roger: Huh?
Victor: Request vector, over.
Cpt. Oveur: What?
T.v.: Flight 2-0-9'er cleared for vector 324.
Roger: We have clearance, Clarence.
Cpt. Oveur: Roger, Roger. What's our vector, Victor?
T.v.: Tower's radio clearance, over!
Cpt. Oveur: That's Clarence Oveur. Over.
T.v.: Over.
Cpt. Oveur: Roger.
Roger: Huh?
T.v.: Roger, over!
Roger: What?
Cpt. Oveur: Huh?
Victor: Who?