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Without any positive selection pressure it seems unlikely that such an "expensive" organ would evolve purely as a side product of other factors in the way I think you are suggesting.
That might be how it started out. But some sort of selection for bigger and bigger brains does seem to be required to explain the result we have ended up with.
Sexual selection seems a viable candidate. Big brains are sexy.
There are several areas of human anatomy that are larger than average for mammals (proportional to our size), and I believe they're all primarily due to sexual selection.
Breasts? Testicles? I'm not sure what you are thinking of here.
So it seems creativity, funniness and other such brain related issues (that this thread is directly about) are a way of adding metaphorical inches.....
Or maybe we have a big brain to try to convince them that size is not all that matters!
And "they" have evolved big brains to see through these futile deceptions.
Let the cock waving begin.....
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