I am one of the admins on a forum for an open-source video game. We have two extremely easy questions required on signup (one asks for part of the domain name o

I am one of the admins on a forum for an open-source video game. We have two extremely easy questions required on signup (one asks for part of the domain name of the site, the other is a trivially googleable game fact) purely to stop untargeted spam attacks and it is remarkably effective. Of course some spammers get through, but that's why we have moderators.