5. William Shatner and George Takei
William Shatner memorably played Capt. Kirk in Star Trek and George Takei played Sulu. The two had no problems while shooting Star Trek, but they had a public falling out later. William Shatner was unhappy that George Takei didn’t invite him to his wedding. One thing led to another, and Takei publicly called Shatner “self-centered” and “a douche”. Shatner called Takei “sick” and “psychotic” in return.