The newest to establish itself: the "involuntary bodily function" synchro.
What're these? Just what the name implies: my body performing some involuntary function at the exact instant that that function's essence is expressed elsewhere, externally from me (in, say, a book or a sign or some independent event). Example: my bowels churning precisely as I randomly read "churn" in a book (this exact one has happened to me, multiple times, as it were). Besides the synchroshock value of the whole thing, these incidents are exceptionally noteworthy due to their involuntary nature -- which is to say, their objective nature, as to almost totally rule out chance coincidence as a reasonable explanation. After all, even if the "churn" I randomly read were visible to me, in my peripheral vision prior to directly reading the word, it could not have conceivably influenced the synchronistic corollary event, except perhaps on a deeply subconscious level (though, more often than not, this happens when the word isn't visible beforehand at all).
Try consciously making your bowels churn. It's like trying to wriggle your ears, but exponentially more difficult (and more awkward). Personally, I cannot make my bowels churn on command, however loudly I yell at them.
No I'm not kidding. I've actually had this happen to me, and not just a few times, either.
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Take the afternoon of 10/20/16, for instance.
I had just sat down to lunch and a book, minding my own business -- when, a couple bites in, a weird (yet wonderful) energy shot up my spine and into the left side of my head, leaving me feeling like a Christmas tree with its star turned on. Then, coinciding perfectly with this phenomenon, I read "left side of the brain" in the book I had open. The phrase registered with precise, keen timing, as to correspond seamlessly with my thought of, "Energy in the left side of my brain."
And, it bears mentioning: I'd had no such weird/wonderful energy-jolts prior to that one, nor did I have any after. Likewise, the book's mention of the left side of the brain was as random and singular, not occurring before or after my physical phenomenon -- which is to say, I hadn't been having these all day, nor had the book devoted an entire chapter to the brain's left side. Instead, both of these single, fluke incidents Just Happened to coincide, and at that exact instant ...
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Or, how about another, from a couple weeks earlier, on 10/6/16.
Same deal as before, except this time it involved my spleen rather than my head. Precisely as I randomly read "twitched" in a book -- my spleen twitched, in a distinctive (and irksome) way that I experience from time to time (but, on that day, I'd not had happen for hours).
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Or, how about this one, also of recent note (10/14).
Just like the last one, basically, except that this time I was writing rather than reading, in a personal health-journal I keep. Precisely as I wrote about my spleen evacuating the night before (yeah, spleens do, when upset, evacuate gas and the like, if you've never had the pleasure of spleen dysfunction) -- BAM! -- it happened again, my typing out "spleen evacuated" 100% synchronistically with my spleen gurgling empty, as to coincide perfectly.
Ah! you might say. But this time, you were writing about the involuntary function, and thus thinking about it, and so the thought could've just acted as a subconscious trigger. Yes, good point -- and, perhaps, that was indeed the case. For this one, at least. (Then again, considering I've experienced several others which would fail to be explained in this manner, but were, pattern-wise, nearly identical ... perhaps this one wasn't just some subconscious tomfoolery.)
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Here's a nice little pair, which occurred back-to-back, on the evening of 9/13/16.
Straight quote from my log:
Had a couple of late and highly notable reading synchros this evening, both of that "involuntary bodily function corresponding to something read" type. The first was when I was in the sauna and got a sudden surge of that bad upset deep in my left guts, a couple seconds before I read "a vicious congestion of the chest" -- a perfect description of this phenomenon in the guts of mine, couldn't have put it better myself. [...] And then, a little less notable but almost identical in nature: "not so tense" almost precisely as my shoulders visibly/palpably relaxed, causing me to slump, again not quite perfectly synchronistic but certainly close enough to be of note.
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Once more, I could post additional examples ... but I won't. If you're unconvinced (or curious), go to the log and search for "involuntary" in the 2015 and -16 sections. (Not that my log constitutes objective proof of the phenomenon, of course; if nothing else, it's good for a laugh.)