A nice little gem
I thouroughly enjoyed this Joker performance, I'm gonna have to rate Koenig a tad bit higher, but of course these were two different types of the Joker's persona displayed. Here we see the Joker being interviewed, in a notion where he is so pompously proud of himself, and calm, cool and sedate in a room with no security guards and an unarmed doctor, just toying with the audience's head here as to when he would strike. What really came across was how the Joker LISTENED to the doctor without coming across as passive or dismissive, but acting intrigued and interested in this man, when we know he isn't, just waiting for the other shoe to drop.
MY only critique (and its a significant one) is the fact that Mark Hamil's voice over from Batman the Animated series and Justice League seemed to be overwhelmingly mimicked here, with the Joker's voice very casually flowing up and down in sound levels. I have to say that you should find your own angle, not take from someone elses, that being said though, it was a good performance.