When people give you blank looks after you ask them a question. It always makes me wonder if my question came out in English or in gibberish!
Today, my temp coworker who's already committing PD (see PD thread for that) had her phone start ringing. After it rang three or four times, I said, "Aren't you going to answer that?". She said, "What?". I said, "Your phone is ringing, aren't you going to answer it?". I got the blankest stare - like she couldn't even comprehend my question, let alone figure out a response! Finally she said, "Who's calling me?", like I would somehow have access to her caller id to know. The phone was still ringing after all that (so someone definitely needed to get in touch with someone at our office!) and she eventually picked it up and answered it. Really though, what is so difficult about the question, "Are you going to answer your phone"?