The question has been cooking in me for quite some time to that I don’t see an answer yet. It is a frequent pattern in sequences about quantum mechanics and Science that “there is no rational reason to even raise hypothesis X to attention or even assign it an actual probability”. This often is supported by mentioning how large the answer space is. While I can kind of guess where all the alternatives at to the “stupid theory” of Eliezer18, I plainly don’t see all the other alternative answers to the question of wavefunction collapse. While I agree that collapse is heavily penalized by Occam’s razor and also for being a chicken among swans, this seems like a primary source of improbability to me rather than large answer space.
P.S. I factor for postulates of exact details under which collapse happens, like “it happens because of human observation”. Such theories do belong to a quite obvious large answer space. I am mainly concerned with postulates like “collapse happens eventually, increasing its probability exponentially on the number of entangled particles”. Which is experimentally falsifiable, but I don’t see many analogous theories.
I have noticed this too! But I think if we unwind the “explain how you got the blue tentacle for your hand” in the sense it is used in this post, it would be “give a reason why waking up with a blue tentacle is not unimaginable”. In other words, it’s used as “human explain” not “formal explain”. I would guess that a lot of people when given this question will concoct some explanation on the edge of their understanding where it becomes nontechnical, some may even say “mutation”. Ultimately, it would be an answer that feels “fit” a whole lot more than they fear waking up with a tentacle going to bed. Eliezer makes up a story of being teleported to a comic, which, I suppose, also feels fit a lot more than we actually fear being teleported when going to bed, because the mere fact of assessing an explanation for fitness allocates way more brain resources than needed to consider this possibility.
Now thinking about it, I can see that questions like “blue tentacle” really show where one’s understanding stops being technical and starts assigning more fitness to impossible things. For some people it’s “mutation”, but when you actually know how mutations work this answer simply won’t occur to you as an actual explanation you are requested to give, it only occurs as a bad example.