Minutes ago, I tried logging into Hilton HHonors, and was rewarded with not one but two terrible examples of CAPTCHA.
First off, I got this one, asking me to identify the ice cream in a series of crappy images:
Apparently I missed one, because then they made me go through it again. I had to find the pasta examples in their images.
Mercifully, I succeeded the second time.
There are reasonably effective, accessible ways to weed out machines from human beings, but these aren’t examples of that. Slapping a series of terrible pictures on the screen and asking the user to find what food items or whatever else they can identify poses visual impediments as well as cognitive.