Sci Fi and Serendipity

On Friday night, I finished reading Rollback by Robert J. Sawyer. This sci fi novel explores a number of major themes and issues, but a seemingly mundane, minor detail in the story caught my attention: Don buying cashews as a special treat for himself. I'd done the exact sane thing earlier in the day, having filled a bag of bulk organic cashews at Whole Foods. I hadn't gotten cashews in quite a while. I love random signs of Divine Providence such as this. What are the chances that I would just "happen" to decide to buy cashews as a special treat for myself, and then later that same day read about a book character doing the same thing?