Jack Bauer
One scene in the premiere of Season Two has become regarded as one of the most memorable and shocking in the entire series. The scene involves Jack Bauer bringing a child molester (named 'Marshal Goren') into the CTU offices and shooting him dead. Jack Bauer then crouches down and begins inspecting his head. Bauer then tells his boss, "I'm going to need a hacksaw". The hacksaw line was subsequently parodied in an episode of "House".