This question awakens my evil mind >=D
I guess first I'd have to try it out on all my contacts,-- to see if it's the real deal!! *evil laughter* XD
Just kidding Grimmjow -- maybe I'll throw it in the Grand Canyon XD lol
*finds Death Note*
Oh, what's this?
*reads Death Note*
So, whoever's names is written in this note will die? Yeah right!
*writes Flames in Death Note just to prove that it is wrong*
I think I might have done exactly what Light did in the first place - rid the world of all criminals in gruesome ends in accordance to the crimes they've committed. But if I sense that I'm going too far, I would discard it as carefully and thoroughly as I can, so that no one else can use it after me and put it to misuse. So that I could save myself from becoming as corrupted as Light. I would never harm anyone who hadn't really done serious misdeed, I wouldn't want to kill someone just because he or she is in the way.
Oh yeah, and I also might put down my own ending in the book, so that I could die in the way of my own choosing. Something like, "Died at 93, peacefully in sleep" or something like that.
Hey, we're discussing all this at random and just for fun, eh XD?
I would destroy it.
See, Light Yagami didn't seem to realize that if he got rid of all the criminals, rapists and murders that the only bad person left would be himself for killing these people himself, Ryuk even hinted at this once in the Death Note manga but Light didn't even seem to notice.
Basically I wouldn't want to lower myself to his level.