I was asked to solve a problem involving determining what elements of a river on a map would be present at various zoom levels. But instead of saying here's the problem, I was provided a spreadsheet and asked to figure out information I needed to solve the problem. What seemed obvious and what I proposed was the flow of a river segment would be the cumulative flow of segments that flowed into it. It would have been trivial to solve at that point but I was constantly confused by the interviewer's misdirection. At the end of time he indicated he was looking for what I originally suggested! Then he was a bit rude in the feedback he gave, suggesting I could not be successful in the position. I suspect he may have been somewhere on the aspergers spectrum based on the lack of empathy or tact in his feedback. Typically an interviewer would say something like thanks for taking the time to interview with us and end it in a cordial and professional manner. Lastly learning they are a .NET shop I wouldn't have wanted to work there anyway