Heard a certain low cost airline reply to a collegue of mine when asked to descend from FL350 to FL330 in order to facilitate an expeditious descent to the arrival airport:
ATC : "***234 to facilitate your arrival, descend now to FL330"
Capt: "Negative. Its too uneconomical for us to begin descent now to FL330"
ATC: "Roger Sir, descend uneconomically then to FL330"
Class.....