The Q&A CAPTCHA is the best thing ever dreamed up for phpBB3
enter the first 4 letters of the word RABBIT
if you can hone it to a subject dear to the heart of your site, then even better!!
think of what people joining YOUR SITE would definitely know then, using the RABBIT example your Q&A CAPTCHA will soon be set up and you can literally say GOODBYE to spambots
I have been using Q&A CAPTCHA the last 2 months, tailored to my site theme and it is absolutely proven, WELL DONE 3.0.8 designers!!