I've thought about similar problems like rewatching your favorite movie, and concluded that treating it as a priority queue or trying to watch it every _n_ days

I've thought about similar problems like rewatching your favorite movie, and concluded that treating it as a priority queue or trying to watch it every _n_ days is the wrong approach; you want to instead be reminded when you've forgotten about your friend Alex or what _The Leopard_ is about, so you can then ping them & catch up or rewatch that movie with a near-fresh mind. (If you ping Alex while you remember them, then maybe there's another actually-forgotten friend you could've pinged instead who would be more valuable to get back in touch with.) It is, in other words, the exact opposite of 'spaced repetition', where you want to review right before forgetting to strengthen the memory the most; in this use-case, 'anti-spaced repetition', you want to review only after you've forgotten it. (https://www.gwern.net/Statistical-notes#program-for-non-spaced-repetition-review-of-past-written-materials-for-serendipity-rediscovery-archive-revisiter https://www.gwern.net/Statistical-notes#program-for-non-spac...)