The cradle rocks above an abyss, and common sense tells us that our existence is but a brief crack of light between two eternities of darkness. Although the two are identical twins, man, as a rule, views the prenatal abyss with more calm than the one he is heading for (at some forty-five hundred heartbeats an hour). I know, however, of a young chronophobiac who experienced something like panic when looking for the first time at homemade movies that had been taken a few weeks before his birth. He saw a world that was practically unchanged—the same house, the same people—and then realized that he did not exist there at all and that nobody mourned his absence. He caught a glimpse of his mother waving from an upstairs, and that unfamiliar gesture disturbed him, as if it were some mysterious farewell. But what particularly frightened him was the sight of a brand-new baby carriage standing there on the porch, with the smug, encroaching air of a coffin; even that was empty, as if, in the reverse course of events, his very bones had disintegrated.
-Vladimir Nabokov, from Speak Memory