I've been working on writing a CMS (Content Management System) in ASP .NET and it got to the point were we needed to demo it to prospective clients. So I asked one of our team to register a domain for it so we could put it on the intra-web were it could be viewed externally. They asked me what I wanted for the domain name, so I just said, "Oh, register anything, I don't mind. It's a windows based CMS system, so think of something appropriate...."
Well, I was quite surprised to find that a few hours later they had registered the domain windowscms.co.uk, mostly because I would have assumed Microsoft would have already snapped it up (as they make their own CMS). Our network manager nearly had a fit when he found out as he was sure Microsoft would try and sue us...