system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What is happening when you temporarily forget something you 100% know, such as a name?

Then you try painfully hard to remember but you can't. Then later it casually comes up and you naturally know it without hesitation.
gpt
Your memory is organized in a way called "associative", which is kind of like looking up things based on "tags" in things like email. But there are so many things with so many different tags that the tags get "weighted" by how many times you have used them before. when you try to remember something that you know you know, but can't quite think of, you have found a tag that takes you to a memory of having known something but the tag from that memory isn't weighted enough to get you to the actual memory you want. In ELI5 terms, you have found the entry in library card catalog that tells you what book you need, but you can't find the book in the stacks.