Two years ago someone was pretending to be Melbourne, Australia air traffic control. A Virgin Australia flight from Gold Coast was instructed to land by this person — the plane came witin 275 feet of the runway before the real air traffic control waved them off. The Boeing 737 climbed to 3800 feet and made a go-round.
Frighteningly that seems not to have been a one-off. A man has been arrested for pulling that same stunt in Buenos Aires.