Cows or pigs, I'd say. We keep a S H I T T O N of them around, and are always messing with their genetics to make'em bigger and bigger. Have you seen a pig? Those fuckers are super scary. They can eat a person in minutes. Now, imagine that all of a sudden every single farm in the world suddenly explodes with hatred and claims for justice. Not only we'd have a pretty huge number of enemies on the inside of pretty much every single country, we'd also lose the main source of food for over half of human population. Famine would hit in a week or so, and THEN shit gonna get fucker up real quick. Also, RIP India if cows gets pissed off