The term "butterfly effect" has been around for a long time, but for better or worse it was popularized by the 2004 Ashton Kutcher movie. For anyone unfamiliar, the butterfly effect describes the phenomenon in which one random event or choice impacts something seemingly unrelated (e.g., the old myth about how a butterfly flapping its wings can cause a hurricane in another part of the world).
The butterfly effect is often used in movies, shows, and books to explain time travel and how doing something like stepping on a butterfly in the past can domino into the apocalypse in the future. As evidenced by Reddit, there doesn't need to be a sci-fi hook for butterfly effect stories to happen, you just need to trace a major event back far enough.
A Mother's Broken Leg Led To Her Son Getting A Younger Brother
A Friend's Passing Led Her Friend To A Master's Degree In French
Not Getting Into An AP History Class Led One Person To A Career In Healthcare
A Roommate's Diarrhea Helped A Man Find His Wife
An Overdrawn Bank Account Led To Four Marriages And Five Kids
An Arrest For Growing Weed Helped A Man Find His Wife