Not sure if this is the same, but I once came across a website with a captcha where you had to rotate a dog so it stood upright, but it was lagging so bad that it would skip several frames, making it impossible to time the angle correctly. After several minutes of trying I gave up and went to a different website with an inferior service, but which did not waste my time.
Incidentally, both links just pop up a sign-up form.
a captcha where you had to rotate a dog so it stood upright
Ticketmaster uses one like this, with various animals.