While I can fully understand and appreciate people using captcha on web submission forms to stop spam / robots, I really don't get why anyone would make a captcha so complicated that it is unusable.
The IIA Netvisionary nomination form has this "lovely" captcha on it:
I saw that and my eyes glazed over.
Sorry guys, but there is no way that I'm even going to attempt to make sense of that.
Darragh also posted about this (he'd know!)