Users Vs. You Users win. This is a horrible idea. The point of systems like Akismet, etc is to avoid doing horrible solutions like this which penalise users.

Users Vs. You Users win. This is a horrible idea. The point of systems like Akismet, etc is to avoid doing horrible solutions like this which penalise users. His apology to IE6 users obviously means nothing to them, because they can't read it!