Heard this on Heathrow North about a week ago:
BA plane (can't remember the type - A320 I think) coming in off LAM shortly after mid-day.
Controller: Speedbird 123 descent to altitude 6000 feet, QNH 1015 mellablars.
Pilot: Descend to 6000 feet, QNH 1015 and I'm not going to try it myself today...
Controller: I once had a Russian pilot read it back as megabars - they're much bigger over there apparently.
Pilot: So the Russian women say at least!