9. "Im Gonna Need A Hacksaw"
In series two, Jack Bauer needed to gain credibility with Joseph Wald's gang to improve his cover and in doing so he created the greatest one liner of the show's entire run. Marshall Goren was a murderer and paedophile who was given immunity in exchange for testifying against Wald. Jack asks to have Goren delivered to CTU for questioning. Then, without warning and in front of his boss and co-workers, Jack shoots and kills Goren. While George Mason and Michelle Dessler look on shocked, Jack utters the immortal line 'I'm gonna need a hacksaw.' He later delivers the severed head of Goren to prove his loyalty to Wald's gang. The bearded recluse that was Bauer at the start of series two showed us what he was still capable of and that we are not watching any ordinary action hero.