I am 100% pro-retinal scanning or bar code tattooed on your forearm.

I got a CAPTCHA yesterday I have never NEVER seen before. Two boxes: first box has a cartoon hand with two fingers pointing out. Other box has a cartoon animal. You have to move the cartoon animal to point the same way the hand is pointing. Five times in a row. I kid you not, it took me five minutes to get it right. The animal never seemed to me to be pointing in the same direction no matter what I did.