Climbing through 4000 ft on the way to the highlands, a 180 kg live pig managed to wreck his cage and was working his way out into the cabin.
Hammy was sharing the cabin with a single passenger who, with some urgency, brought the matter to the pilot's attention.
A swift RTB (return to base) saw the plane, pilot, passenger and pig on the ground within minutes.
A constructive discussion was had with the carpenter who built that particular cage during which the pilot suggested said carpenter join us on the next few flights sitting astride his creations.
The carpenter declined citing a fear of flying.