Jumpseating in a DHC7 run by an obscure national airline whose language I just happen to speak after spending time there in my youth.
Crew just presumed as I was an Australian pilot I could not speak said language.
On final, F/O's altimiter playing up, and something else as well, Capt starts to describe everything that is wrong with the aircraft in his rather eloquent languge, not realising I could understand every word.
Disembarking after pulling up at the gate, I thanked the Captain in his native tongue. He was surprised, then went white.
