I had IBM as a client. A very high level executive was over the moon when we showed a sql query, a basic select-agg-groupby thing. He loved our "natural language data extraction technology". The meeting wasnt about that, he just asumed we had invented sql queries.

His staff was furious but couldnt correct him live in front of a large audience.

We signed a multi million contract based on this persons lack of understanding, we didnt even have to lie, he just fooled himself.