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This is how the grandfather paradox was first explained to me: Imagine a boy whose grandfather invented a time machine.

Discussion of the butterfly effect, the grandfather paradox, or big balls of wibbly wobbly, timey wimey stuff are scarce.

Part of his reasoning involved the paradoxes time travel would create such as the aforementioned situation with a billiard ball and its more famous counterpart, the grandfather paradox: If you go back in time and kill your grandfather before he has children, you can’t be born, and therefore you can’t time travel, and therefore you couldn’t have killed your grandfather.

Add a few flying saucer chases, cook up a quickie solution to the grandfather paradox and this movie might have fallen at the intersection of “E.T.” and “Back to the Future.”

The most famous of these conundrums is the so-called “grandfather paradox.”