A co-workers son asked him this, and I got a braincrash when I heard it.
EDIT: Co-workers son asked if the brain keeps the location (of internal organs) a secret from you?
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Everything your body does has evolved to help itself survive and make more of itself – ideally by being helpful to you being able to have your own children (some day), mainly to be able to find food, find and impress a partner, or at least not die early.
Knowing where your hands are is helpful to your survival so you can move them to where you need them to be, to pick things up, to deflect incoming blows, or to avoid them being hurt. Any early form of body that was able to get even the vaguest idea of where its limbs were had an advantage over a form of body that had no idea at all. This means it was more likely to be able to find and pick up food, avoid predators or injury, and thus more likely to have kids some day.
Some of its children, grandchildren or great grandchildren will then have an even better idea of where their limbs are, and these ones are also more likely to have children themselves in future, because they are better fed, more skilled and good at avoiding being squashed or eaten. Eventually the advantageous type outnumbers the useless type, and we say the creature has evolved to have that feature.
In contrast, knowing where your internal organs are gives you no advantage at all – it doesn’t help in any way, because you can’t do anything with them whether you know where they are or not. Therefore the ability to know where they are has never evolved.
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