If I were a SADISTIC super villain, first I would ruin the greatest of citties/country/utopias and such. I would ruin the lives of all who tried to stop me, as well as those who don't. Those who pose a real threat to me, shall witness a slow, painfull execution of their loved ones, via TV/DVD/VHS/Live/However I can show them their agonazing torment(s).
I shall slowly destroy this pityful world, just like my torture victims. I shall laugh at everyone's misfortunes, even my own! Even If I happen to die by someones hands, I'll have the pleasure of knowing that my deeds shall be like permanent scars in their minds, and as I burn in hell, I'll remember the look in their eyes as I made them suffer.
And their thoughts: "...Why...why do you do this to me...the pain...it won't stop...why must you make me suffer...why do you do this...it hurts...it hurts...it hurts..." I shall smile, nay, laugh as I spend an eternity burning, knowing that I made them suffer, that I made them experience true pain, that I opened theie eyes to a new world of sorrow, that I...was hell on earth...
...I just came up with a new villain.