I spent an evening in Manchester with John Peel over twenty years ago, we did an interview, and then went out for dinner in Chinatown. i can remeber almost verbatim our conversation, although not the restaurant - but apparently he had that effect on most people who met him, such was his personally unacknowledged wit and charm. I also remember vividly conversations with my first serious girlfriend, over thirty-five years ago.
Some things just stick in your mind without concious effort.