Heard a story (apocryphal) a few years ago about a US aircraft in London.
London: "**** Cleared to descend to 3000 feet, QNH 1015"
****: "Roger, uh cleared descend 3000 feet, QNH 1015. Ahh, could you give me that in inches?
London: (Quick as a flash) "Certainly, **** descend to 36,000 inches, QNH 1015"
Pissed meself for days after hearing that.
Edited to say "Someone tell me it's true!"
[ 17 July 2001: Message edited by: Bally Heck ]