An example from my day job which I’ve been doing for almost 20 years.

A customer, while looking at his phone, said what I was telling him was wrong with 100% confidence. The trick is he was looking at the same thing (in the catalogue) I was, which had the real answer. He was literally denying reality and it confused me at the time. I only realised afterwards he was reading off the AI results as if the AI was all knowing and had the true answer.