Disturbing Phonecall

My colleague Jane's phone rings, she's not at her desk, so I answer:

Hello. Jane's desk.

(heavily accented, female, Spanish perhaps?): Is Jane there?

I'm sorry she's working from home this morning, can I leave a message?

[long pause] No... [long pause] No.

Sure?

Yes, sure. Can I borrow you for a moment?

Yes, of course, where are you?

Standing up behind you.

OK.

I put the phone down, and turn around.

Nobody is standing.

I stand up and look down the office.

Nobody is standing.

I look to my half right.

Nobody is standing

I look to my half left.

Nobody is standing.

I look out of the window at the car-park.

Nobody is standing.

I sit down, and await the call-back, which will say "where are you?" or "why didn't you come over?"

I wait.

I get back to work. Distracted. Looking over at Jane's silent phone.

It's been nearly an hour now, and it's really bothering me way more than it should... Grrrrr!