In 2009, Transformers: Revenge of the Fallen barely eked out a victory in its second weekend at the domestic box office. Two years later, its follow-up looks much better situated. On Friday Transformers: Dark of the Moon took in an estimated $15 million, bringing its domestic total up to $228.9 million in ten days. Though it still trails the $269 million Fallen had earned at its ten day point here in the US, worldwide Tf3 passed the $500 million mark on Thursday and should pass $600 million sometime today. In second place, Warner Brothers’ Horrible Bosses brought in an estimated $9.9 million from 3,062 locations for what looks like a weekend total of $26 million. Meanwhile, Sony’s Zookeeper looks like 2011’s latest disappointment with a first day estimate of $7.4 million and a weekend projection of just $20 million. Details and analysis tomorrow.