Microsoft interview. I was just graduating college, and was super anxious walking in to my first interview. The interviewer realized that writing on the whiteboard was going to be awkward for the problem he was asking me to solve so he let me just sit down at his computer while he hung out to to the side and watched me work in notepad. I think that was the best way to do that interview, because the second I started writing code my brain flipped in to code-writing mode and everything relaxed. One of the better interviews in my career.