Similar problem at work. IT, but we are -not- helpdesk/support.

Have a few frequent flyers who will continually just keep knocking on our (locked) door, constantly, no pauses, until someone turns up. Don't even have the decency to knock and wait at least 3 seconds.

Inevitably it's something they should be calling the helpdesk for (no we cannot reset your password or create a shared calendar for you) or they want to 'just borrow' some random cable that we'll never see again. They get all huffy when sent away, but it keeps happening.

So thankful we won the fight with management to be allowed to lock our door, it was even worse in the before times...

Sorry that triggered a rant... :|