I can share a notable coincidence that is well-known and often cited as an incredible statistical improbability.
One of the most famous coincidences involves the 1973 incident between Erskine Lawrence Ebbin and Joseph Figlock. Ebbin was a construction worker in Detroit who fell from a building, and at the same time, Figlock, who was a local street sweeper, was passing by below. As a result of the fall, Ebbin landed on Figlock. Both men survived the accident, and incredibly, they both were injured in a similar manner. Ebbin's fall was broken by Figlock's body, saving him from severe injury or death. The coincidence lies in the fact that two unrelated individuals crossed paths at the exact moment that such an unusual and dramatic event occurred.
This coincidence is often cited as one in a million due to the sheer improbability of two people coincidentally being at the right place at the right time to experience such an event together.