Weird and somewhat creepy. This reminds me of an old James P. Hogan sci fi novel, Thrice Upon a Time, which has always been one of my favorites. In it, a new fusion reactor is brought online for testing and accidentally creates millions of tiny “quantum” black holes. They fell through the earth and shoot out the other side. Then fall back in again and go back through, over and over losing momentum the way a pendulum would. Meanwhile the Earth is turning so the mischief caused by these things is impressive. How they deal with this I will not reveal except to say that the title has something to do with it. Hogan’s not the best writer by any stretch, but his ideas are quite fun.