There is a short story PIGS IS PIGS often found in college lit books, especially in the 60's and 70's. It is a tale of old days when a man tried to ship guina pigs by train from a remote town. The stationmaster decided that Any pig is a Pig (i.e. Hog) for billing and shipping purposes. The balance of the story is about his humous problem and delimna as the guina pigs continue to have litters.
This web news article is quite humous too, but in a diffent way ---- I think it is funny as hell .... and a great way to "earn" more time in the slammer ...