Or it tells you to pick out pictures of cars and shows you a pickup truck. Now you have to figure out if people would call that a car or not. How about a delivery truck? A motorcycle?
Or it will ask for pictures of crosswalks, and you have to decide if 3 pixels of a crosswalk in the corner of one of the pictures counts.
If it makes you feel any better, I'm fairly sure the answer to those questions don't count. I know I've gotten some reCAPTCHAs "wrong" and gotten marked as a human. It's picking up on a lot of signals, not just whether or not you're "right". So, the good news is you can relax, and safely rewrite all the questions to "Do I think this is a store front?" or "Do I think this square counts as a crosswalk?" or whatever without loss.
My "favorite" is the one where you have to select the boxes with traffic lights. Does that mean just the actual lights, or the entire structure? More importantly, what does Google's AI think the answer is?
Or it will ask for pictures of crosswalks, and you have to decide if 3 pixels of a crosswalk in the corner of one of the pictures counts.