CAPTCHA: Just to prove you are a mathematician I’ve ranted before about impossible CAPTCHAs. This one takes the cake pi. It’s gotta be a joke, and a good one a that. :-D Hat tip: Baekdal. By Brent Logan Engineer. Lawyer. WordPress geek. Longboarder. Blood donor. Photographer. More about Brent. View all of Brent Logan's posts.