This hack uses a text-based human validation system in order to verify that a form submitter is human and not a spam robot and it will remember a successful validation so the user won't have to re-validate each time. One validation phrase is picked at random each time it's needed, and the validation phrases/questions and responses are fully customizable. You can put as many or as few as you want. It can be configured to validate on new registrations and guest postings.