Carl Jung is so fascinating to me. Many of his ideas are familiar yet there was no way I could have known them before I began studying him.
Synchronicity is an idea that Jung talks about. Have you ever thought of someone and then run into them soon after?? Or sang a tune in your head and have it come up on the playlist or radio? That's kind of how synchronicity works.
Another idea that is from Jung is archetypes. My explaination of archetypes are the patterns we recognize. Jung spoke of of a "collective consciousness"; memories and experiences that are shared in the subconsciousness of a race or culture. He used that idea to explain why we tend to see history, literature, lives repeat certain patterns.