there's another one where some twin pilot calls the ATC and request a read on his ground speed. 250 mph or something.
then an F-16 pilot does the same thing and he's going 600-ish mph. and he's acting kinda snarky about it.
then a blackbird pilot asks for his ground speed, and he's going 1900 mph.
(or something close to that)
edit: i was watching a show about the blackbird and the pilot who did that, told the story....so very true story.