We notice what is attributed to value or a threat.
Your first goal when dealing with someone you want to leave an impression on is to become emotionally relevant.
The range between the + and – sign is a normal experience. This experience is forgettable because it is so normal.
Your commute to work or you brushing your teeth is an example of a forgettable and normal experience. Similarly, if you had a hundred similar conversations, they will not be memorable.
When someone massively compliments or insults you, that is memorable. Any abnormal event, such as a near-death experience during a normal work commute, is memorable. Anything outside of the normal range is memorable because it is considered valuable or threatening.
Your goal in game is to do things that are outside of the normal human range and memorable.