Old man asked for tech support. Windows wouldn't uninstall an application.
When the uninstaller launched, it presented a list of components to uninstall. There was a list of checkboxes and two buttons, "select all" and "remove all". He kept clicking on "remove all", not realizing that "remove" referred to removing the ticks from the checkboxes, instead thinking that it meant "uninstall all".
This is why UI design and wording matters.
Related: "Are you sure you want to cancel" dialog, where in some localizations the "yes, cancel" and "no, cancel cancelling" buttons end up with the _same_ label, because the translator never saw them side by side (or maybe even the same translator didn't translate both, as the generic "cancel" one was likely translated way earlier).
