I work for a software company, as part of the technical helpdesk for our products, this just happened a minute ago.
Me: Hello, this is ***** tech support, hoy can I help you?
Her: Yeah, hello, I have a problem with your **** program. Im not able to go in. I have a screen that says "Windows is shutting down" and it's been there all morning.
Me: did you try to..
Her (interrupting) : I even tried to unplug the computer, and it still wont change.
Me: Wait, you unplugged your desktop computer and it still showed "windows is shutting down"
Her: Yes, that's right.
Me: On the monitor, with no power at all.
Me: are you sure you unplugged the correct computer? Im sorry, but it's just not possible for an unplugged monitor to show anything.
Her: Oh.. (awkard pause) ok, it's ok now. Thank you, thank you.
God... I dont like windows but you have to admit that it is a persisten OS.