Some more!
During Sim phase at School of Fighter Control, Tom sees an emergency indication and calls "D&D":
Tom: "Hi, it's Boulmer, any details on the 7700 over the Thames Estuary?"
D&D: "Yeah, it's SPEEDBIRD 162 with a birdstrike."
Tom: "Umm... it's at FL360."
D&D: "Yes...?"
Tom: "A birdstrike at 36,000ft?"
D&D: (laughter in background) "Umm... yes. It was a superbird."
Not strictly a "line", but this had me creased last week while monitoring VHF guard:
Idiot (Britannia pilot): "Hallo, we're now cruising at 20,000ft over Paris, soon I'll be descending as we approach the coast. The time in Bournemouth is 1655, so please do adjust your watches. Weather... it's a little cloudy, not too cold, and should brighten up nicely tomorrow for you."
BA Pilot: (In charming, refined voice) "Hmm, what a lovely little speech!"