I've always thought that if you're going to insist on repeating captchas, then it would be nice if they varied between attempts. There is nothing more frustrat

I've always thought that if you're going to insist on repeating captchas, then it would be nice if they varied between attempts. There is nothing more frustrating than being presented with the same completely unreadable captcha-style over and over again. That said, not forcing people to repeat them certainly seems much more humane!