The 'It's More Likely Than You Think' meme originated from a late-1990s promotional campaign for PC Tools, an anti-virus software. The original ad warned users about computer viruses, but it became an internet legend in the early 2000s after being parodied on sites like Something Awful and 4chan. The most infamous version replaced 'computer viruses' with 'centipedes in your vagina,' creating a surreal and absurdist warning that took on a life of its own. Today, the template is used to mock fear-mongering advertisements or to present bizarre, unlikely situations as imminent threats, maintaining its status as a foundational piece of internet humor history.