2007: A biotechnology company in Sioux Falls, South Dakota, breeds cattle that are immune to mad cow disease. A relieved beef industry pours funding into the lab.

2008: Mad-cow-immune cows become the standard for livestock, but it is discovered that their prion-resistant brains have given them a primitive, sinister intelligence. Farmhand kickings, rodeo clown gorings and milkmaid stompings rise 400 percent. A few of the cows escape into the wild, making capture difficult. The government decides to sow biogenetically engineered grasses in their grazing areas, grasses that will release deadly spores into their systems.

It could happen. Go read the rest of it. And make sure you read the author's bio at the bottom.

When Good Cows Go Mad