The Swiss developmental psychologist Jean Piaget called this principle'object permanence' and suggested that babies spent the first two years of their lives working it out. And of course those two years are prime peekaboo time. Looked at this way, the game isn't just a joke, but helps babies test and re-test a fundamental principle of existence: that things stick around even when you can't see them.
Maybe evolution fixed it so that babies enjoy peekaboo for its own sake, since it proved useful in cognitive development, but I doubt it. Something deeper than mere education is going on.
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