I was on the tube this morning and I heard a man quite clearly speaking to his wife and son with two voices. Not consecutively, but simultaneously, in harmony, like the voice of a futuristic computer. To tell the truth it could have been more than two, it was hard to tell. He was from somewhere unspecified on continental Europe, where people are kind of overweight and wear glasses with tiny lenses and breathable waterproofs as their normal coats.
Is this a standard thing?