In OZ long ago:
A group of RAAF Vampire jets heading opposite direction to a Speedbird who was (from memory - t'was a loooong time ago) looking for climb. Both asked to report sighting and passing (procedural control - outside Radar coverage).
Speedbird: "I can see the jets - well clear, request climb"
ATC: "Vampires confirm sighted and passed Speedbird" (rule required mutual sighting and passing)
RAAF Jet leader (who stuttered a bit) "Neg..Negative sighting"
Speedbird: "Oh come on man, you must be blind!!"
RAAF Jet Leader: "I'd rather be b..b..blind that a f...f...f**king Pom!"