When I saw the trailer for this, I thought, "Bah, what a stupid concept!"
But holy shite, it REALLY happened to some guy:
The story of 'Sir Alfred', an Iranian man who lost his papers while in transit and lived in Charles de Gaulle airport for more than eleven years, occupied a significant, although decidedly eccentric, place in the global news media throughout the 1990s. 'Sir Alfred', whose real name is Merhan Karimi Nasseri, lived between the pizzeria and an electronics store in the airport's Terminal One, "his days punctuated by the rhythm of the flights", from 1988 until confirmation of his refugee status in 1999.