About 10 years ago I bombed an interview. Very bizarre, I had two interviewers - one had such a strong Chinese accent that I couldn't figure out what she was asking the entire time. When I explained to her that I couldn't understand her, she just repeated what she said multiple times, each time equally obscure. By the time she had conveyed what she meant, we were nearly done. I thought she was talking about advanced mathematical topics that I had never heard of, but she had just mispronounced a bunch of standard names.
The other interviewer just came in and spoke at me for an hour - never even asked a question, or gave me an opportunity to interrupt him by taking a breath.
Very bizarre experience. I have had hindsight after interviews in the past though - I've had some people try cast questions in an "interesting" way, which was sufficiently different to make someone less familiar with the field, yet who knows the answer they are looking for think they are looking for something else. Specifically, someone was looking for the answer "that is a minimization problem - use variant X of gradient decent to find local minima and variant Y to try search for global minima", however, it was phrased as "I'm a mountain climber, and I'm trying to find the "best view", how do I find it given a function or height map of the terrain?" - to which I tried to find the point on the map that could see the most terrain, basically trying to find the "least occluded" viewpoint (highest peak would be an approximation, but definitely not necessarily the best view since it may be surrounded by peaks nearly as high). People have to be very careful how they "re-word" questions - they can change it entirely, and more than likely this will confuse the smarter candidates, who consider the question asked from all angles, rather than just a narrow, but standardized interpretation of it.