Try creating an HTML file containing no less than 96 (!) consecutive dashes, setting the encoding to Hebrew (1255) and opening it in IE6 (non-SP1). Wait 2 seconds. Crash. Repeat.
Silliest bug I've ever seen.
Yeah, that's a nasty one. In fact that's just "--" that's forbidden in comments.
Also CDATA sections can't contain characters.
But that's not a bugs, that's behaviour by design to make XML parsing easier.