Technically, the "prank" is much less effective today. Modern browsers will usually ask, "This site is trying to open multiple windows. Allow?" If you click "No," the joke ends instantly.
If you are looking for an unblocked version, you are likely finding one of two things:
The "You Are An Idiot" website is a piece of internet history—a digital artifact from an era when the web was a bit more chaotic. While you can find unblocked mirrors today, the original "threat" has been neutralized by better browser security.
But what exactly was this site, why was it blocked, and is it safe to seek out "unblocked" versions today? What was YouAreAnIdiot.org?
The Infamous Legacy of YouAreAnIdiot.org: Is It Truly Unblocked?
The real "trap" was trying to leave. If you tried to close the window or hit the 'X,' the site would execute a JavaScript command that spawned multiple new windows. Each new window would bounce around your screen, and if you tried to close those, they would multiply further. Eventually, the sheer number of windows would consume your computer's RAM, causing it to lag or crash entirely. Why was it blocked?
Some sites claiming to be "YouAreAnIdiot Unblocked" may actually contain real malware, hidden behind the guise of a vintage prank.
Since modern browsers (Chrome, Safari, Firefox) have built-in "pop-up blockers" that prevent the original script from working, most people now experience the joke via YouTube videos. Is it safe to use "unblocked" versions?