There are myriads of stories of people recounting their experiences with unusual coworkers, sometimes extremely unpleasant ones. Here's mine. I work for a tech company that, besides doing its own research&development, provides consulting services for other companies (which is actually pretty common here, among most tech companies). "Providing consulting services" is just a fancier way of saying, essentially, "renting expert developers". (This is a service that's quite on demand. If a company can't find anybody with enough expertise to outright hire, they will seek such a developer from another company, even if it's more expensive. The advantage is that the "consultant" is almost guaranteed to be competent and an expert on the subject matter, and it's much simpler and easier for the company to temporarily "rent" him than to actually hire someone, which comes with a whole swamp of legal obligations here.) I was one time ...