After reading this post, I would expect that the most probable explanation for one to wake up and see a tentacle instead of his hand will be a dream, in which such a specific tentacle is conjured because this individual fell asleep while reading this specific post
After reading this post, I would expect that the most probable explanation for one to wake up and see a tentacle instead of his hand will be a dream, in which such a specific tentacle is conjured because this individual fell asleep while reading this specific post