This happened to my friend. He was in Shanghai and got talking to a Dutchman in an Irish Pub, the dutch man said he had lived in Ireland.
"Where",
"Dublin",
"Where in Dublin",
"Donnybrook",
Where in Donnybrook
"Greenfield Pk"
What Number
"Number xx"
My friend then promptly reeled off this guys landline telephone number. He had been staying in the house a very good friend used to live in