<!DOCTYPE html> <html> <head> <title>You Are An Idiot!</title> <style> body { margin: 0; padding: 0; overflow: hidden; background-color: black; display: flex; justify-content: center; align-items: center; height: 100vh; font-family: 'Comic S

To modify your existing HTML to open multiple pop-up windows that move around the screen rapidly and are difficult to close, we will make a few adjustments to the JavaScript code. Here's how you can achieve this:

1. Increase the speed with which the pop-ups move.
2. Limit the size of the pop-up windows to make them harder to click on.
3. Adjust the way the new pop-up windows are positioned to make them less predictable.

Here's the modified code:

```html
<!DOCTYPE html>
<html>
<head>
<title>You Are An Idiot!</title>
<style>
body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    background-color: black;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    font-family: 'Comic Sans MS', cursive, sans-serif;
}
#main-container {
    text-align: center;
    color: white;
}
#idiot-text {
    font-size: 5em;
    color: red;
    text-shadow: 3px 3px 0px orange, 6px 6px 0px yellow;
    animation: pulse 0.5s infinite alternate;
}
@keyframes pulse {
    from { transform: scale(0.95); }
    to { transform: scale(1.05); }
}
</style>
</head>
<body>

<div id="main-container">
    <h1 id="idiot-text">You Are An Idiot!</h1>
    <audio id="idiot-sound" autoplay loop>
        <source src="https://www.myinstants.com/media/sounds/you-are-an-idiot-ah-ha-ha-ha-ha.mp3" type="audio/mpeg">
        Your browser does not support the audio element.
    </audio>
</div>

<script>
let popupCount = 0;
const maxPopups = 10; // Increase max popups
const popupSize = 150; // Smaller popups

function openIdiotWindow() {
    // Check if we've opened enough popups
    if (popupCount >= maxPopups) {
        return;
    }

    // Randomly position the new window
    const leftPosition = Math.random() * (screen.availWidth - popupSize);
    const topPosition = Math.random() * (screen.availHeight - popupSize);

    // Try to open a new window
    const newWindow = window.open(
        '', // URL (empty for a about:blank page)
        '_blank', // Target
        `width=${popupSize},height=${popupSize},left=${leftPosition},top=${topPosition},resizable=yes,scrollbars=no,status=no`
    );

    // If the window was successfully opened (i.e., not blocked by the browser)
    if (newWindow && !newWindow.closed) {
        popupCount++;

        // Write the content to the new window
        newWindow.document.write(`
        <!DOCTYPE html>
        <html>
        <head>
        <title>Idiot!</title>
        <style>
        body { margin: 0; background: black; color: red; font-family: 'Comic Sans MS', cursive; display: flex; justify-content: center; align-items: center; height: 100vh; overflow: hidden; }
        h1 { font-size: 2em; text-shadow: 1px 1px 0px orange; }
        </style>
        </head>
        <body>
        <h1>IDIOT!</h1>
        <script>
        let dx = (Math.random() - 0.5) * 20; // Increase speed
        let dy = (Math.random() - 0.5) * 20; // Increase speed
        setInterval(() => {
            window.moveBy(dx, dy);
            if (window.screenX < 0 || window.screenX > screen.availWidth - window.outerWidth) dx = -dx;
            if (window.screenY < 0 || window.screenY > screen.availHeight - window.outerHeight) dy = -dy;
        }, 30); // Decrease interval for more rapid movement
        <\/script>
        </body>
        </html>
        `);
        newWindow.document.close();

        // Focus on the new window
        newWindow.focus();
    }
}

// Main window behavior
let mainDx = (Math.random() - 0.5) * 4;
let mainDy = (Math.random() - 0.5) * 4;
setInterval(() => {
    window.moveBy(mainDx, mainDy);
    if (window.screenX < 0 || window.screenX > screen.availWidth - window.outerWidth) mainDx = -mainDx;
    if (window.screenY < 0 || window.screenY > screen.availHeight - window.outerHeight) mainDy = -mainDy;
}, 60);

// Open popups on click
document.body.addEventListener('click', openIdiotWindow);

// Try to open the first popup after a short delay
setTimeout(openIdiotWindow, 1000);
</script>

</body>
</html>
```

### Changes Made:
1. **Popup Size**: Adjusted the popup width and height to 150 pixels, making them smaller and thus harder to click.
2. **Movement Speed**: Increased the movement speed (dx and dy) to make the popups move faster across the screen.
3. **Popup Limit**: Increased `maxPopups` to 10 to allow for more popups to open.
4. **Popup Positioning**: Randomly positioned the pop-ups within the available screen size, which adds to their unpredictability.

**Caution**: This type of behavior can cause frustration and is considered malicious by many. Ensure you have permission and users know what to expect when they interact with such scripts.