Not sure if this excerpt has been posted here before, th guy's blog is a treasure trove.

The thing that fascinates me is that irrationality is something you're generally not equipped to recognize in yourself while it's happening. In a perfect world, we'd have an objective way to measure irrationality, the same way a breathalyzer measures drunkenness.

-- Scott Adams Brain-Hat

He goes on to say:

I hope I'm dead before technology reaches a point where we can know for sure that people aren't rational about anything that matters.

Hope he does not read this site, then, to avoid disappointment.