It’s called the wolverine effect, I can’t remember where I learned that ironically.
We all know what a wolverine is, but can you tell me where you learned it from?
It probably has a fancy name like “memory source origin amnesia” or something, but it basically goes along the lines of your brain not remembering where you learned something, you just remember the thing.
It’s why propaganda is so effective even on people looking for it.
How about asking someone to repeat something twice, really really wanting to retain the information and then you fail for the third time?
Also does anyone else end up losing the entire message because you are telling yourself to remember it, and then you realize, they are done talking and you still don’t know?