Jack O'Neill

Samantha Carter : If Daniel's right, this artifact has been doing this since Neanderthals were still a dominant species on Earth.
Jack O'Neill : Ah, that takes me back.
...
Jack O'Neill : I got a better idea. Instead of helping you, why don't we sit back and watch you get your ass kicked. That way you'll be dead and we'll be glad.
Ba'al : You cannot be serious.
Jack O'Neill : Mmmmmm...yes I can. I just choose not to... some of the time.
Ba'al : With your insolence, you are dooming not just your world but all of humanity.
Jack O'Neill : I think big.