For anyone else who isn't familiar, type 1 fun is where it's a fun experience and you have fun memories of it. Type 2 is a not-fun experience where you look back on the accomplishment fondly. Type 3 "fun" is a tongue-in-cheek description of something where you didn't have fun doing it, and also don't have fond memories of it.
Great comment, and this phrase is going in my pocket.
> write-only memory
Could this be The Secret(tm) to transmuting base lead into gold? Rewriting the very memories that make up one's life.