>And if a heavier, sub-moon-size black hole came too clos

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>And if a heavier, sub-moon-size black hole came too close? "We certainly would notice if one passed near Earth, since it would affect the orbits of all of our satellites," he wrote in an email. "I imagine that it would mess up GPS for example." The good news here, says Brandt, is that mini-black holes of this size would pass between Earth and the Sun once every 100 million years or so. "We would, on average, have to wait much longer than the age of the Universe for one to pass through Earth. Though such an event is absurdly unlikely ... It would cause some havoc," he wrote.

>"We would, on average, have to wait much longer than the age of the Universe for one to pass through Earth. Though such an event is absurdly unlikely ... It would cause some havoc," he wrote.

>Though such an event is absurdly unlikely ... It would cause some havoc," he wrote.

What did he mean by "some havoc"?

Source: http://www.sciencealert.com/countless-tiny-black-holes-may-be-hurtling-through-space-like-bullets