This article is based on the AskReddit question "What’s the smallest decision you made that had the biggest impact on your life?"
[Source can be found at the end of the article]
1/26. One morning my girlfriend and I took extra time to make a good breakfast before going to work, which ended up making me late for the train, so I wasn't in my office on the 77th floor of the World Trade Center on September 11, 2001.
2/26. Sitting on the ground, first day of college, room key fell out of my pocket because I refused to put it on one of those stupid lanyards they give you. Pick it up. Look down a few minutes later and see another key on the ground. Pick that up, thinking fell out again. Turns out it wasn't my key. When I tell my roommate I now have two keys, including a key to someone else's room, she tells me she heard from a friend that [cut] this guy in a neighbouring dorm lost his key already. I had to find his room and write an apologetic note on his white board telling him where to find me to get the key back. Been married nearly 7 years now.
3/26. I worked as a personal assistant to a wheel-chair bound guy with cerebral palsy. One Wednesday, he wanted to go out, but had no idea what to do. A friend of mine had mentioned he was going to a standup comedy show that night (a rarity in Sweden in 1989). I suggested this as a possible outing, and he couldn't think of anything better, so we went.
Long story short: they had an open mic, and I tried out; ended up doing standup comedy professionally for nearly a decade.
4/26. From 6-12th grade (or age 11-18 for those not from the USA), I had a school bus ride home that lasted about an hour. It sucked, and I spent the morning going in doing homework and the afternoon home reading. One day, when I was in 8th grade, I ran through the library in panicked "class is out and I have just a few minutes to pick out a book else I'll be bored for an hour" mode, and happened to choose one on astronomy. Still remember it exactly, it was called From the Big Bang to Planet X by Terence Dickinson and had the Andromeda Galaxy on the cover- a galaxy I've had an affinity for since now that I think about it.
Anyway, by the end of that school bus ride I was already thinking about what kind of telescope I wanted to buy, and realizing with a shock that any 13 year old could technically grow up to be an astronomer, even if they lived in Pittsburgh. And I wanted to be an astronomer ever since, and I am one now! All because of that one book I happened to grab for my school bus ride home.
5/26. One day I refused to see my father (parents had been separated most of my life), I don't remember why, I just did not want too. Turns out that was the last straw for him, he pumped himself full of drugs and killed himself a few days later. As you can imagine that has impacted a lot of things in my life.