If an Algorithm Wrote This, How Would You Even Know?

Is there an algorithm that can (a) point to something and (b) say something about it?

(a) and (b) can be weakened as much as necessary to give an interesting answer.

This sentence was not written by an algorithm

This sentence was written by an algorithm that humans did not deliberately implement, and do not fully understand.

skynet?

I welcome our robot overlords*

*This message was not written or paid for by an algorithm or robot overlord