The Joker's Wiki (http://en.wikipedia.org/wiki/Joker_%28comics%29#Powers_and_abilities) mentions it... It's only explictly stated in a few pages from Arkham Asylum: A Serious House on Serious Earth where the psychologist talks about it. That book isn't actually canon, but the idea? Fascinated me for years.
no subject
on 2006-09-06 01:14 am (UTC)