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But just at that moment, as though at a signal, all the sheep burst out into a tremendous bleating of-
"Four legs good, two legs better! Four legs good, two legs better! Four legs good, two legs better!"
It went on for five minutes without stopping. And by the time the sheep had quieted down, the chance to utter any protest had passed, for the pigs had marched back into the farmhouse. (10.13, 10.14, 10.15)
The pigs are able to reverse the idea of the saying "four legs good, two legs bad" by changing one simple word. Similarly, by making seemingly small changes to their stories and explanations, the pigs are able to control the minds of the rest of Animal Farm as well.