Here's my coincidences (Not!) story:
My wife and her future brother-in-law (ERS) were born in the same hospital in DC within 24 hours of each other.
His father (ES) had been penpals while attending Loyola University in Germany with a fellow attending Loyola in Montreal.
That man was from the side of family tree with the pure French spelling of my last name. We have the "Anglicized" spelling of the name. He and my father were born three months apart. He met and befriended my father while they were students in Montreal.
He later became my sister's godfather.
When we grew up in Virginia, John would sometimes drive with his family to Richmond, after visiting his transplanted German friend (ES) who had moved to the DC-area in "Northern" Virginia.
ES's son (ERS) went to college, met my wife's sister (MS), married her, and they moved to Houston.
My father's sister's son moved to Houston after college, got engaged, and scheduled his wedding.
John persuaded ERS and MS to reschedule their daughter's baptism to align better with the other event he planned to attend in Houston. They complied with his request.
John attended my first cousin's wedding and my future niece's baptism the same weekend in Houston. He is the godfather of both my sister and my wife's niece!
John Jr. arranged a 25th wedding anniversary for his parents. My fiancee and I were invited but were traveling in Florida just before this event so we didn't attend. My other sister arrived just as ES and his family arrived. They didn't know each other but met and discovered they lived a few miles apart. If my wife and I had been there, we would have recognized both ES and John.
At this point, none of these connections between the three families was known.
At the end of a long Christmas visiting my wife's relatives, my wife's sister (MS) out of the blue asked me how I spelled my last name (it's unusual). I told her and she replied, "Oh, then it's not the same."
"Not the same? If you know someone with a similar name, we're probably related."
"It couldn't be -- he's not from around here. He's from Canada."
"Even more likely. My father's from Montreal. What's the name?"
"Couldn't be the same. He lives in Ottawa."
"Still very likely. Is the name spelled like this?" I spelled the old family name.
"Yes, but it couldn't be the same."
"What's his name?" "John."
"John!? Oh, no, you've got it wrong, John lives in Montreal."
"Is he a hospital administrator in Ottawa?"
"Yes. But it's not the same."
"No, John works in Ottawa but lives on a farm just outside of Montreal, with his wife Joan and their five children."
"Yes, but it can't be the same!"
She finally came around and we realized it was the same John.
Finally, I asked MS to write John a letter about her sister and her boyfriend. She had a picture of us together hiking in the mountains near ES's cabin. I gave her my business card, and asked her to send the photo and my card and tell him she thought it was interesting that my name was so close to his.
John was a prolific letter writer. Letters to his friends and relatives, letters to the editor, letters all over the place. This was before the internet and email were public. But about four days letter, my father, MS, and I each got a letter from John. While I was reading his letter -- his mind was blown about the amazing coincidence and he wanted to reveal it to everyone -- I noticed about three places where the language was bobbled. Very minor blips, but I have a editor's eye. "Brain farts" I called them and wondered why they popped up.
The next day at work, I got a call from MS. "Did you get a letter from John?" she asked. "Yes." "Uh, me, too. Listen, Joan just called. John was sitting at a stop light and had a stroke and died yesterday."
Does anybody think this could be coincidental? Really?