Mad Max (BATTD2:BP)

"Don't you see it? The concept of "sanity" is nothing more than a ridiculous joke of a lie used to keep order. You people always insist on keeping things stable and maintaining order in society. Order... HA! Where's the fun in that!? Why can't you just put out the Joker cards and mire the whole set in chaos? You see, insanity is the only thing with true inherent meaning to society, because deep down inside, all people are madmen and monsters just waiting to burst out of their cocoons of civility. That's why I'm here, to give everyone the little push they need to shatter their little cocoons... and let the monsters out."

- The Batmonkey Who Laughs, as he is infecting Max with a modified Jestertoxin in an attempt to transform him into Mad Max

Mad Max was a malicious personality which The Batmonkey Who Laughs attempted to awaken within Max by gassing him with a modified version of the Jestertoxin so that the persona could permanently take over Max's mind and transform him into a force of unspeakable evil, an ace-in-the-hole in case he had failed in his plan to convert everyone on the Monkey World and the Land of Ooo into laughing serial killers. Laughs also did this in an attempt to prove his philosophy: that deep down, everyone is inherently immoral and insane.