In the late 70's I had to fly the infamous "Lead Sled" from Vanimo up to Goroka for maintenance and carried a large crate containing a young Muruk for one of the Kargo Bois who was making an instalment on his "bride". Towards the end of the flight it had started to make a determined break for freedom. The head was out and he had one foot clear and was nearly free by the time I landed. Could have been messy!