John: That's coltan. If that's what you're made of, no wonder you're so dense.
(He shares a grin with Sarah.)
Cameron: (not getting the joke) Not density. Heat resistance. T-600 models had a titanium alloy endoskeleton, but it was vulnerable to heat. Coltan alloys have a much higher melting point.
Sarah: You know what I love about you guys? Even when you've evolved into the ultimate indestructible killing machine, you're not above self-examination and improvement.
Cameron: Thank you.
Sarah: Please shut up.