Even if you haven't seen 2004's The Butterfly Effect, you're probably aware of the concept in its title. It hails from Edward Lorenz' lauded work with chaos theory. Lorenz first popularized the idea in regards to weather, with the most famous example being that a sudden change in the way a butterfly flaps its wings can cause a tornado weeks later.
In pop culture, however, we associate the butterfly effect with Ashton Kutcher's dumb face and the horrifying consequences of altering the timeline. These memes tend to reflect the latter, and based on their cursed nature, we're, like, 100% sure that time traveling would be a mistake. See for yourself.