Easiest SPAM challenge I've had in awhile

You probably don't know this as I implemented it after you joined Ozzu, but on the registration page here I have two spam challenges. One is the typical CAPTCHA based system but the other is this:

Which of these bark? (cat, dog, mouse)

and they have to write in the correct response. I am thinking that one is pretty easy too, but it does fool a good deal of automated bots just making it one step harder than reading the phpbb3 captcha. Alot of spammers will try and break that and once they are successful they can break through massive amounts of forums, except for those that have made things a bit more difficult. Not worth their time to take the extra steps though