Overheard in NDjamena
ATC : (Callsign), cleared XYZ, After departure right turn out squawk 7700
American CHC crew, very drily : Uhhhhh, thats the emergency code sir.
ATC : eeeeeeeeeeeehhhhhhhhhhh, I say again squawk 7700
Yanks : Uhhh, we are negative emergency sir.
ATC : STANDBY
about a min later he clears them to takeoff and refuses to mention anything about squawk codes, the CHC guys just said to him "We will be squawking 2000"
Amazing!!