I remember the G and T’s arriving on the 727 (so no guesses which airline then) flight deck as the engines stopped in BHX one afternoon in the mid 1980’s.
Soon after the passenger door light illuminated, a customs officer arrived on the flight deck and demanded that we pay the duty on the said gin.
My captain shouted immediately back at the said customs officer, that we were in the process of completing the shut down checks and if he did not leave the flight deck at once then he would be reported to the CAA as a serious flight safety hazard.
The customs officer turned and left the flight deck, and the captain said ‘right lads, I reckon we have 10 secs to down the drink or pay the duty!’
3 landing drinks downed in 3 gulps and the flight deck door burst open to reveal one very p*****d off customs official, looking at 3 empty glasses.
Brilliant