Mike Lee, toughest programmer alive, came up with an insanely competent idea for a comments system: Lemur CATTA, which uses reading comprehension to quiz you on the contents of a blog post before you are allowed to comment on it.
Yeah, I know. Seems like some gradeschool teacher—or Kaplan temp—would have come up with this idea before now, doesn’t it?
BTW, careful with Mike’s blog—his content is SFW, but the site title isn’t.