Hang up if someone phones you from Windows
I just got a call. The caller display showed "international". The accent was foreign.
Operator: "Hello, this is N calling from the technical department of Windows Computer Systems. Could I speak to the main user please."
Me: "I'm sorry, there is no company called Windows Computer Systems."
Operator: {Silence}
Me: "It doesn't exist. Where did you say you were calling from?"
Operator: {Hangs up}