This is so funny
Flight safety has its lighter moments. In April 1995 a South African Airways Boeing 747-400 set off from London to Johannesburg with 300 passengers down the back and 75 breeding pigs in the hold. Two and half-hours out from London, the flight crew suddenly saw flashing lights indicating a fire hazard in the hold. The airliner was over Algeria at this stage but the captain decided to return to Heathrow. On landing, it was found that the severe stress of the flight had rendered the pigs so flatulent that their gas emissions had triggered the sensitive alarm system. Incredulous passengers, who were delayed for 15 hours, were only told of the cause of the alarm once the aircraft had resumed its flight to Johannesburg.
I think that this is worth to be posted here