"I have a friend who’s a commercial pilot. Around five years ago he was doing a flight from LA to Tokyo when an anonymous caller phoned in a bomb threat while they were over the middle of the Pacific. Apparently they have procedures for this kind of thing, but there was nothing anyone could do in this situation except stay calm and not alert the passengers (obviously). He said for the rest of the flight every bump of turbulence made his adrenaline spike. They took this case especially seriously because there was a group of foreign dignitaries sitting in the first class cabin."