Ask them where Kinloss is and look at the empty stares
I fear the problem is rather worse than not knowing the whereabouts of a dying Scottish airbase. Remember Jade Goody and her belief that Cambridge was in London...?
But then some Canadian cousins of mine were camping in Wyoming a few years back and got chatting to some Americans who asked where they were from.
Cousins: "We're from Canada"
Yanks: "Oh, where's that?"