The “Magic” 8 Ball (which doesn’t have any coke in it, despite it’s name) is notoriously inaccurate. About 60% of responses are positive, 20% are negative, and 20% are neutral.
I fixed that with my “Magic Cynic Sphere” which has about 40% negative responses, 30% positive, and 30% neutral. To my surprise it had an unbroken streak of total accuracy for several months until I retired it.
I tried to make a larger one but it didn’t work right.