It doesn't matter if I'm on the phone or in an exam room with a patient. The other person comes right at me, shoving something ON TOP OF whatever I'm doing, and then gets upset that I haven't completed this new task ten seconds ago.
Keep in mind that NOBODY listens to a damn thing that I tell them to do.
And the infamous, "I didn't mean NOW. When you are finished with what you are doing."
Well, when I am finished, I have already lined up dozens more tasks that came in before you did. Plus, watching me continue with my task and then erupting with "You're finished! Now this!" before I'm finished is really quite rude.