Christian Bale's sister found his profanity-riddled tantrum on a movie set disturbing, and believes the actor "needs help," reports the Telegraph. "It's terribly sad," said Bale's sister, Sharon. "He seems to be incredibly stressed and angry at the moment." Bale was arrested last year after allegedly assaulting his sister and mother. He has apologized for his "potty mouth" meltdown during filming of Terminator Salvation.