Mathias Crochon (French pronunciation: [ma.tjas.kʁɔ'ʃɔ̃]), better known as Rockin' Squat (French pronunciation: [ʁɔ.kin'skwat]), is a French MC. He is the son of the actor Jean-Pierre Cassel and the brother of Vincent Cassel and Cécile Cassel. In the mid-80s, he created the famous rap group Assassin (rap crew), becoming the first artist of this scene to mention politics and social problems in his records.