Dark team - this is a great idea that I used myself. I had a startup building an Excel-like product and we had a casual office in SF. We didn't pay anyone but g

Dark team - this is a great idea that I used myself. I had a startup building an Excel-like product and we had a casual office in SF. We didn't pay anyone but got some consulting teams to come into our offices for a few days so we could watch them work. The consultants got to tell their client that they were engaging with this cool new startup's tools to analyze the client's data (which we never saw), wear T-shirts to work, and get free food. We got to see where the problem areas in our product were.