Mundane telepathy.

Yes, it's happened in other instances though none as frequently as the one I described in the original post.

I finish thoughts for people all the time, and if it's someone I'm close to, have the same sentence happen at the same time constantly. Again, same words. A while back, I had a friend I would converse with almost daily online, on a vast variety of subjects. It would happen so often that we would joke about it.

Yes, again that could be explained by profiling, me simply knowing the other people so well that I can predict what they're going to say, but many comments were out of the blue and random, not associated with the conversation preceding them.