Too true !
"Bombay, Bombay this is Delhi - shut up, Bombay !"
Flew with one of our WW II Polish Captains into Teheran from Karachi, and after a long and fruitless attempt to raise Teheran on HF I threw my headset off in disgust and made some racist, and politically incorrect remark about the provenance of Teheran ATC control.
The Captain just smiled and picked up the mic. and proceeded to call Teheran in the almost incomprehensible fractured English / Polish accent that he still spoke.
Teheran answered him immediately. You bugger, I said, and he just smiled and replied - it's the way you hold your mouth my friend ".