Phone call. When running our application, customer gets an error that only happens for 2 reasons: bad install, and bad folder permissions.
Me: I need you to verify the permissions on the folder.
Tech: It shows "system", "administrators", "users", "everyone", (and two other groups I don't remember.)
Me: OK, what are the permissions for Users?
Tech: How do I check that?
Me: Click the Users group. What does it show at the bottom for Full Control?
Tech: Done. How do I check that?
Me: Is the box to the right of Full Control checked?
Me: Check it. Then click Apply.
Tech: Done. Wait, now the other groups at the top of the window are gone...
This was a 50 minute fuster where she couldn't even rename a folder logged in, ostensibly, as Administrator. Though I treated her as a "hostile witness" so to speak when she asked me how to map a network drive...