Hi,  
A few weeks ago I found a story on someones blog based in a farm where one of the boys is tricked into entering a chute used to castrate pigs. The chute is designed such that the balls are trapped between two rails as they move along and slowly get stretched further and further away from the body until the end where they are banded off and dropped into a pen of pigs and others tied off the same way.

I'd love to read it again but have lost the link. Anyone have any idea where I might find it ?