Leopard's whiskers.

During the Mau Mau uprising in East Africa, they would grind leopard's whiskers into a fine powder and sprinkle it on your food. Once in your stomach, it reacts with the acid and expands massively, shredding the inside of your stomach.

You literally shit out your guts and die in considerable pain.

Your digestive juices also then continue to break down the leopards' whiskers, so there is no evidence.

Do you think SOBO could get hold of some? I am not sure that a tabby cat's whiskers will have the same effect?