How does someone qualify to be remembered by you forever? AND What memory do you remember from long ago with the shortest interaction?

Here, I am asking specifically about a memory of a person, nothing traumatic AND of the shortest interaction whether or not you remember the specific person.

There is a scienctific answer but... from your own observation, try to answer my question.

Memories that evoke strong emotion are more memorable.. yet some people's minds help them cope by locking away traumatic memories..

Some memories are still there, far in the back of our mind and rarely resurfaces at uncontrollable random times.

Usually it takes months of ongoing interaction for me to remember a person.

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Anyone with photographic memory? 😜
How does someone qualify to be remembered by you forever? AND What memory do you remember from long ago with the shortest interaction?
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