How about this one? The local radio station rang me up to say they were doing some "research" - had I done a trial lesson several years ago on a particular date with a certain person? Got the logbook out and yes I had. Did I recall anything about the flight etc. Yes I did - after landing I asked him whether he had done any flying before since had flown so well - a natural pilot. He said that he had never been airborne before and this was definitely his first flight. I was stunned since he had almost flown the whole flight unassisted!
The guy from the radio station then told me they were doing a programme on regressive hypnosis where they put you under and take you back to a previous life. My trial lesson had been a fighter pilot in World War 2!