One summer day back in the mid-1970s, a woman I know was hitchhiking on Cape Cod with two friends. The three, all college students, got picked up by a geeky guy in his late twenties who told them he was on a crew making a movie about a shark attack. Actually, he said, he was the director. They asked him how he was doing the shark attack in the movie.
"We have a machine," he said. "We have a mechanical shark."
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