*** A/C flying at FL130 ***
ATCo: Climb FL290
Pilot: Climbing FL290
ATCo: Er .. confirm your rate of climb is in excess of 5000 ft/min?
Pilot: Confirmed
ATCo: I don't think your passengers will like that
Pilot: Well, we almost dived into the ground because of a bug in flightgear
Pilot: Better uncomfortable than dead
