Oh my gosh. You just reminded me of one from The Lion King in SF. This lady was talking to the person playing Rafiki and she said:
Woman:Oh the music was so beautiful and what were those words and the beginning?
Rafiki actress: It's it my native language
Woman: Oh really? What is it?
Rafiki: Swahili
Woman: oh!
She totally didn't know that they were actually speaking another language, not some random words. I was so embarrased listening to her.
2008 European Tour
London: Les Mis, Lion King, Sound of Music, Joseph, Hairspray, Billy Elliot
France: Le Roi Lion, Cabaret
Germany: Der Konig der Lowen
Holland: Tarzan & Les Mis