Back in the early days of RedHat, they used to be located in a non-descript office park in the Raleigh-Durham area. I remember working for an obscure Sales Automation company and our office was located upstairs, where if you turned to the left you'd head into our office and if you turned right you'd enter the small RedHat Software offices. I used to pop my head in occasionally to this company that was making this stuff called "Linux", and even asked for help when I was secretly setting up a Linux server at my company's office to replace our Windows NT 3.51 server.
If I had only turned right when heading into work instead of turning left when walking up those stairs, I'd today be a millionaire. :(