improvised. >> hello. anybody in there? you must revolt against your oppressors. you have nothing to lose but your shells. >> reporter: he was honest about the fact that it took lots of drugs to fuel that much energy. a battle compounded at times by a messy personal life. the struggle providing fodder for his stand-up. and also perhaps giving him empathy in the role that won his oscar, the psychiatrist in "good will hunting." >> what you said to me the other day, about my painting. >> huh? >> stayed up half the night thinking about it. >> reporter: williams tried several times to go sober. >> a lot of people said, is the person who said those things -- the same person? >> drunk? responsible -- and, are they the same? are you yourself? >> no, another side of yourself that even you don't know. dr. jekyll and mr. jack daniels.