They were coming from the plane’s loudspeaker. Flight attendants assured passengers it was a technical mixup. It was presumed that once the flight got underway, the noises would cease. Instead, they continued for hours: weird guttural moans and grunts projected over the intercom, apparently coming from nowhere. In an interview with Gizmodo, Collins characterized the noises as a cross between “explosive diarrhea, vomiting, and a weird, vaguely sexual moan.” Having listened to the noises, this writer would add “bad impression of Boris Karloff as Frankenstein’s monster” to that list. In general, the noises are weird, uncomfortable, and resistant to easy...