The best interviews have been interviews where I have been warned ahead of time what to expect. Ie in the phone screening interview I was given an informal hint

The best interviews have been interviews where I have been warned ahead of time what to expect. Ie in the phone screening interview I was given an informal hint that I should add unit tests to my programming task (the next step of the interview process). Or the time I was told that my in-person interview would include a hello-world with a certain IDE and a certain language (which I had no previous experience in). I felt comfortable because I knew what to expect and I could prepare ahead of time. I think it also showed I was listening and I was willing to learn new things.