Don't make me angry Gaius, you wouldn't like me when I'm angry. From Battlestar Galactica (2003) S01E06 Litmus

Gaius and his Six talk about the Cylon suicide-bomber and whether he tried to kill Gaius as well as destroying the Cylon detector, when Gaius refuses to complete the detector, Six threatens him by saying "Don't make me angry Gaius, you wouldn't like me when I'm angry".
From Battlestar Galactica 2003 S01E06 Litmus