I had an interview several years ago. Talking with the owners, small shop (6 people? 8?). We get to a "let's code something on the white board" segment. Fair enough. "Write me some code that does XYZ" (I honestly don't remember what it was - something basic but not trivial).
I took the marker, went to the board, put the marker to the board, then turned around and asked a couple questions. They answered, I sketched out a few lines of code, and that was that.
I sat down and one of them said that I was the first person ever to ask a question before writing. Everyone else had started writing, got part way through, then asked for clarification on the ambiguous parts (or worse yet, never realized part of it was up for interpretation).
Everyone handles whiteboard tests differently, but it was interesting to me to get that perspective shared with me about asking questions before writing on the board.