One of my co-workers posted this gem on the Web dev blog, which actually came from another blog, Command Line Warriors. It is basically how to crash IE in just 5 tags and a CSS declaration.
<style>*{position:relative}</style><table><input /></table>
that is it. Put that in your code and it will crash IE. Another co-worker noted you don’t need the closing table tag. Not that any of it is particularly useful… However it is mildly interesting.