I do market research. A client hired me to create a new pricing strategy for a product (I can't say what or he might see this). I put in hours of research, conducted focus group testing, and produced two viable strategies that I presented with a full list of pros and cons, with my personal recommendation for one.
He didn't want either of them.
Client: Let's go with [$30 over my most expensive option].
Me: Um... okay? What are you basing that on?
Client: I just feel it'll work, and I want to be in the luxury market.