Anh-Tuan "Cao Boi" Bui is a contestant from Survivor: Cook Islands. Cao Boi gained the ire of his tribemates for his outlandish humor often involving racial stereotypes and overall eccentric behavior. He however introduced the Split Vote strategy in the event a Hidden Immunity Idol was played. Although the plan did not save Cao Boi from being voted out, his strategy would later evolve and become one of the most pivotal aspects for later seasons of Survivor.