The black cat is one of those users who, when you’ve taken the trouble to actually come down to their desk, continues their conversation with the person a cubicle over, completely ignoring all that you’re trying to explain to them. And they’ll probably complain about you after you’ve gone.
And the problem was something very simple that could have been fixed over the phone, if you could actually get them to LISTEN.
Not that I’m bitter, mind you...