As someone whose body has on more than one occasion done something that made a doctor look deeply and thoroughly confused, I can confidently say it can be an isolating and jarring experience.
After some googling and reading comments of fellow weird-head-noise-sufferers, it's believed to be the sound of your spinal fluid, though there's admittedly not a whole lot out there on it.
To me, most things that come in lists (numbers, colors, months) have personalities and genders. I can explain, for instance, that six is a very motivated, self-starting young man, whereas four is a slightly-masculine woman who is very pragmatic and rational.
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