Me: (Telephone conversation) OK, tell me everything you see on the screen. I don't care if you think it's important, tell me everything that's on the screen.
(Computer operator tells me what's on the screen.)
Me: You're sure that's everything? It sounds like a simple error. Is there anything else?
Computer operator: No, that's that's everything.
Me: That's really strange. I'd better come down and have a look. I'll be there as soon as I can.
(I drive for an hour to the site, where I find a simple error message that could have been corrected with a single keystroke.)
Me: Did you see this?
Computer operator: Yes.
Me: You did?
Computer operator: Yes.
Me: Didn't I tell you to tell me everything that was on the screen, even if you didn't think it was important?
Computer operator: Yes.
Me: So why didn't you tell me about this?
Computer operator: I didn't think it was important.