Everyone who thinks that users will read prompts and behave sensibly in an interface at all times really needs to spend an hour trying to talk Double Click Dave, their elderly relative through doing something basic on a computer when their first response is to (a) forget what menus are, (b) click everything they see, (c) dig themselves into a rabbit hole and (d) randomly say "it didn't work, help me" after closing the window before you can read anything they've done. #UX