Ever made a small decision that completely changed your life? That's the butterfly effect, an idea from chaos theory that something as tiny as a butterfly flapping its wings could eventually cause a tornado. Lately, it's gone viral on Instagram.

Users are posting stories under #butterflyeffect, showing how random moments like choosing a different route, texting someone back, or showing up to an event that led to major life shifts.

These reels often show dramatic before-and-after clips: from uncertain jobs to dream careers, from being single to unexpected relationships.

One reel tells the story of someone who almost skipped a networking event but went—and landed their dream job. Another shows how replying to a message led to moving cities and starting a whole new life.

Of course, there's debate. Some say not every story counts as a true butterfly effect. But the trend sticks because it taps into something real: how unpredictable life is, and how small choices can lead to big outcomes.

Next time you're facing a tiny decision, maybe think twice. It might change everything.