Legit just got this prompt.
Are these stairs? Blinds/shutters? A water feature minus the water? Something else??????
I can tell you the squares people click just to get through the prompt, but like, this is even worse than the overpass vs bridge epistemological issue.
This is only vaguely related, but the worst captcha I ever got was one of the first times I tried to log in to my Playstation account on the official website. I was presented with a series of images -- each one containing an icon of a mouse, an icon of cheese, and a simple maze. I was then instructed to click which of the mazes was unsolvable. I was then asked to do this over ten times in a row. (as in, ten+ sets of six mazes) Each new mutation changed the color of the maze, and eventually the color of the mouse and the cheese slightly.
I didn't save an example of the captcha, but it's notorious enough that you can google it and find others complaining about it on places like Epic Game Store.
I only saw it once, and it was a very long time ago. But it took me multiple minutes to solve in order to log in to my PSN account.
