Late night phone calls

What is it that makes people talk to complete (non-telemarketer) strangers over the phone?

It was about 1 o'clock this morning, and I was fast asleep. All of a sudden, the sound of my phone ringing (or rather, the phone vibrating on the desk) wakes me up, as it so often does. I answer the phone, still half-asleep, and find that it's a girl I don't know on the other side. I try to tell them, as best as I can in my current state, that they must have dialled a wrong number on whoever's phone it was that they were dialling from. I mentioned where I work and then they mentioned a couple of workmates' names, and what I thought about them. It was probably nothing, but my paranoid self tells me that I was being 'scouted', in a manner of speaking. Either that or the late night hotlines are getting really desperate.

It was a very unexpected and unusual phone call.