Humans develop an incredible ability to pattern match. So much so that it's built into our DNA. When we see another monkey reach for a fruit, crack a smile, or grow annoyed, our biology immediately 'primes' the exact same muscle groups used for the task seen by queing up signals in the motor cortex, etc (thanks, Gautama, for that piece of the "karma" puzzle). We can mimic expressions, facial or whole body, some of us to the point of "impersonation" (Jim Carry does who?
Humanity also has the pretty amazing ability to project impressions of humans onto their environmental events (from stormclouds to wild animals), which we call 'anthropomorphication'. Aren't we just the clever monkeys, to have made up a term for that.
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This is not a coincidence.
This is a feedback-loop
Increasing the number of elements that the muscle cortex and related brain areas can model, accelerating the system when the brakes are taken off.
I've got a few more of the damn twisty things intuited out(subconscious feedback loops, that is).. but this is the first one I've managed to pin words to following a bit of parsimony. Look how much negentropy it took to pull that off.