Navinder Singh Sarao appeared in court to fight his extradition to America, where he is accused, among other things, of spoofing the futures market by placing phoney orders.
A process called spoofing and with neighbor spoofing the number on your caller ID is meant to look almost identical to yours to increase the likelihood that you pick up.
They are also narrowly trained for specific applications and thus fail badly when outside the limits of that training or in response to " spoofing" by adversaries.