For those who don't know, super sanity is where you're so sane, that you appear crazy to the world. Like you're extremely aware of things others are not. On another hand, I suppose super sanity could be taken for insanity- as if you understand life so much that it renders you unstable, and some people can't handle it.

I think Joker is definitely what NightFrog described a "super-sane" person as.
Additionally, he puts the mask of "insanity" on, or rather exaggerates his eccentrities to make others think of him as someone unworthy to be taken "seriously"... Just so that they are taken by complete surprise at his deceitfulness.

However, I think he enjoys every minute of it lol.

Insanity

Well, I'm not really familiar with the concept of "Super Sanity" As my concern, I think the Joker through his whole life, suffered so many traumas, I think he is confuse about his true self, yes, is true, he puts this mask to hide, what I think is his true self, he went through things no one could understand, and as a result of that, we have The Joker.

He might be insane, but Joker has done some truly evil things that make it seem like sanity...