Google decided to try to CAPTCHA me to death today. It made me solve over 25 different CAPTCHAs in a row for a website that I have been logging into for years. I was even using the same browser I used previously to log in.
It eventually agreed that I am not a robot, but it kept asking me about buses, motorcycles, and bicycles over and over again. It even tried to trip me up by asking me to find a bicycle in an image showing a motorcycle... more than once. Nice try Google. I am not a robot. I know the difference.