Like Billy, I see myself more as a anti hero (Neutral good) person than sadistic. With that being said, when I'm irritated, I do have thoughts about the best way to hurt a person (Not to the point of real physical or emotional pain. Just enough to make them think about what they've done/embarrass them). When I'm angry. Well. I don't get angry. For a reason. Anyways, I do find this comment interesting: "Some take it as a point of personal pride that they don't hurt people despite what is an incredible capacity to do so, particularly realizing how deeply into people's heads we can get." I've heard this comment countless times from INFJs, I would think that contemplating how much damage you can do to a person might be a sign of sadism. Or perhaps it's just Ni examining situations.
About me: When I get irritated enough to act, I don't tend to go all out and try to destroy a person from the bottom up (Although I suppose I can. Never really thought about it) I just tend to point out their hypocrisy, characters flaw in relations to me, and such. More Te/Fi.