What metaphysical things have you encountered in your life?

My girlfriend once told me a strange thing that she experienced personally. When she was young, she lived in her grandparents' house. One day after dinner, the family enjoyed the cool in the yard. When she saw a little boy running out of the yard, she shouted, "Grandparents, someone!" " Strangely, her grandparents didn't see any children running by at all. She also asked, there are many people, it is said that because she is a "yin and yang eye", she can see things that others can't.