I absolutely HATE it when I get to a form and have to distinguish the letters or numbers to prove that I am human and not a robot. Most of these CAPTCHA (Are you human?) tests suck and I have to magnify the screen 500% to try to figure out the letters and numbers. So, I get delighted when I see clever Are you human tests that don’t suck. On www.Builtwith.com, I found such a thing.
It simply asks me to move the slider to the cat to prove that I am a real human. You gotta love it!