system
Reminds me of a story I heard long ago from a old freight hauler. One flight in the wee hours of the moring, with long intervals of silence on the radio, a tired-sounding voice interrupted the stillness:
UNKNOWN: Yaaaaaaawn… I’m #$%&ing bored…
CONTROLLER: Station broadcasting, this frequency is designated for air traffic control. Identify yourself!
–Brief silence–
UNKNOWN: I said I was #$%&ing bored, not #$%&ing stupid.