A Singapore Airlines flight was forced to make an unscheduled stop due to a rather unexpected issue.
The plane, which had been carrying more than 2,000 sheep from Sydney in Australia to their new home in Kuala Lampur, had been making good progress when the smoke alarm suddenly sounded to indicate that there was a fire somewhere on board.
The pilots acted quickly and brought the aircraft down for an emergency landing in Denpasar, but when they went to investigate the problem they discovered that there wasn't really a fire at all.
They eventually concluded that "the smoke indication was the result of exhaust gases and manure produced by the sheep." In other words, the alarm had been triggered by farting farm animals.