My mother was a newly-appointed 23 yr-old schoolteacher in a township in a dairy-farming area. She was lodging with a family about a quarter mile from the school, her only transport was an old bicycle.
One day she announced to her hosts that her brother-in-law's grandmother had died and the funeral was in two days time in a neighbouring town at 11am ?& she was desperate for a lift to attend.
To this her landlady responded, "Interesting co-incidence, John & I will be attending his cousin's funeral at the same time in the same town. Which church is it to be held at?"
They compared their notes and discovered they were planning to attend the same lady's funeral. Neither party had been aware of their respective family's semi-distant relationship before this.