PETA slammed for National Boob Day post as “drinking from a cow’s boobs” image leaves Twitter disturbed Chaitra Krishnamurthy 2 years ago Trending Is milk linked to autism? Old PETA. The post has led to people to accusing PETA of posting cartoon bestiality to celebrate National Boob Day. - Advertisement - In their #NationalBoobDay post PETA showed a cartoon picture of a man drinking from a cow’s milk creating area with a message saying, “Are you drinking from a cow’s boobs this #NationalBoobDay?”.