A few years ago, a friend, who is an ATCO, was sitting on a 747 at Gatwick when the captain announced that there would be a delay due to an 'ATC Slot'. When the captain cleared the use of mobile phones, and realising that his watch were on duty, the ATCO phoned LTCC to jokingly complain about them delaying his holiday. The watch manager was rather upset, as there were no ATC delays, and so phoned the airline to complain. The airline ops then suggested that the captain should admit that the plane was broken.
Airclues