The "YouAreAnIdiot" virus, also known as "Trojan.JS.YouAreAnIdiot," is a notorious internet prank from the early 2000s. It is a JavaScript-based malware that originated from a website displaying a flashing "You are an idiot!" message along with a laughing sound. This virus opens multiple browser windows, causing the system to slow down or crash. While it is more of an annoyance than a serious threat, it highlights the early days of disruptive online behavior and the evolution of cybersecurity.