Evil? Of course I’m evil. 100 on the scale, baby.
You just won’t realize it, of course, until it’s too late, and you’re strapped to that rack in my cellar, the taste of laudanum-laced Burgundy lingering in your horrified, gaping mouth… 
Honestly, if it hasn’t happened by now, it’s not at all likely. I’ve had lots of practice in not letting myself be ruled by anger. I’m still evil, of course, but the twisted fear/anger/aggression of the Dark Side isn’t my style.
I’m calling it a 5, just because the word “impossible” tends to turn around and bite me.
I think I’ll echo RTF and give The Incontinent’s Answer:
Depends.
I mean if there’s a hot space princess in a gold bikini involved, just tell me where to sign.
But if she turns out to be my sister, then I’m right back at zero.
I can be persuaded to do things I normally would think immoral/feloneous for a couple of margaritas.
Which “dark side” are we talking about? The Dark side of the Force in particular, general Evil Overlord nastiness, or voting Republican? 
I’d say i’m around a 90.
Just for the fact that every once in a while, a stray Moralistic thought will get in the way, and I do something good.
I’m right around a 0. I have absolutely no tendancies that could be considered “evil.” I guess I’ll always be the server and protect sort.
–==the sax man==–
I’ve gone completely over to the dark side but not the way you think. I am a “Soot lord” which means I use all black powder in my competition guns. No modern 20th century smokeless powder, at least in my cowboy shooting guns. My shotgun, rifles and Colt navy pistols get a pure mix of chrcoal, sulfur and saltpeter just like in the old days. No cape or helmet but I do wear a black sash around my waist. It’s actually a Civil war era medical corps sash but it’s been adopted by black powder shooters.
Somewhere less than 10.
[Yoda]
Remember what you have learned, save you it can!
[/Yoda]
Creaky, I’m just going to start following you around to read all your posts. I hope you don’t mind.
[sub]Oh, and by the way, I’ve got some Easy-Cheese and saltines right here…[/sub]
I’m fairly evil myself, come to think of it. But I think that’s been pretty well established already.
Dark side, other side, what’s the difference?
I don’t do anything evil. I may think of evil things to do, but I’m not the one who will actually do them. In fact, I’m almost too “good”. Does that put me on the negative scale? Can we get some reference points to this 100 point scale?
Of course a chap aspires to being a 2 (you can’t be a 1, because you’d have the sin of pride).
But if you offered me the chance to fire off a Death Star (at an uninhabited planet, naturally), I’d slide to a 99.
Oh dear.
I’m one of those people who probably wouldn’t even get tapped for the Dark Side. Or, if I did, they would kick me out because I would show up for the initiation wearing T-shirt that says “Have you hugged your kitty-cat today?”
I’d probably end up in the Sith Ladies’ Auxiliary, driving the clones around in the car pool and organizing the bake sale to raise money for new Star Destroyers.
Never. Not in a thousand years. I’m a 1, for certain. I think if I tell myself that enough, I’ll convince myself that it’s true…
Give me a red light saber and the power of the force and I’ll crush the rebellion once and for all.
It depends how I feel at the time.
I am capable of both stratospheric righteousnes and
abysmal wickedness.
If a Jedi feels no emotion, only serenity, I’m in trouble
Say about 65.
Geobabe…
Easy Cheese and Saltines??! My God, young lady, that’s not evil; that’s just beautiful! I am sooo hungry!
I passed up Wendy’s Late Nite Drive-Thru on the way home tonight from Halloween Karaoke Howling, and I’m now quite sorry that I did. I’m utterly famished after torturing the masses with a heinous rendition of “Bad, Bad Leroy Brown”. Since I bought all of that candy and had NO trick or treaters, I guess it’s Tootsie Rolls for this gal.
However… regarding your propensity for evil… you really do need to come to Baltimore, my dear, so we can unleash our combined Evil upon the unsuspecting peasantry.
Their silly little torches and pitchforks will be but a laughable, empty gesture in the face of our all-encompassing Darkness! Heh, heh, heh!
Methinks I should talk to Weirddave about a BaltoDope…
So, you want to know about converting to the Dark Side, huh? Well, it’s easy, really. You just let yourself drift, looking back only to say goodbye.
That’s what I did. I was a journalist who went to public relations. I told myself since I was working for a municipality, I wouldn’t be as bad as corporate P.R. That’s another little trick of drifting to the Dark Side. You tell yourself what you want to believe.
Now, I have one of Satan’s diminions as my boss, and I do his bidding. The pay’s much better, however. And, I’ve been able to buy a home, and my wife can stay home with the baby.
I’m sure that’s what Lord Vader was thinking about, too, when he moved to the Dark Side. Just wanted to make a better life for his family, I’m sure. 
I’d be in the late 60s, early 70s. I, too, am all for easy power and think that it would be somewhat easy for me to turn towards the Dark Side. But if the Emperor gets to me during one of my bad days (like, say, when I have a test in Math), that number could jump into the 90s!