SG-1 had serious moments and dark moments and light moments and fun moments.

I forget the exact circumstances, but there's this moment where O'Neill and Carter are separated by a force field, O'Neill is on the escape side, Carter is trapped. O'Neill starts pounding on the force field with a chair or something, desperately trying to break her out, and when she says "Colonel just leave me and save yourself." He shouts NOOOO! at her. He's ready to tear the force field down with his bare hands to save her.

This same character delivers the line "In the middle of my back swing?!"