I would say that in life I always go for the Paragon option, I always try to be the good guy and do the right thing, even in most video games, Bioware mostly my character is as blue as that water found in an airplane washroom. In pen and paper RPGs though, that can be a completely different story.
My friends and I back in college always enjoyed playing Dungeons and Dragons Ver. 3.5 and often we would play the characters that would save the neighboring town and be back for a tankard of ale. One time a friend decided that now was the time we attempt to be evil, be the bad guys that want to rule the world in the name of some dark god. We had each been brought back for our own reason. My character's back story was that as child he had lost his parents, but instead of taking up a sword and seeking vengeance he pursued the dark arts and after a loss of his three friends he chose to animate them as his own person undead entourage and proceed to go on a random set of events that eventually led him to the main story.
Cue to the session I remember the most, in most events when traveling to a major city or village, my character wouldn't be cute or charismatic as his other companions he would just cast undetectable alignment and just travel un noticed. It wasn't until this very session that this worked in his favor as the city had a barrier that teleported all evil alignments to a cell and left my character questioning where everyone went. Now was the time for my character who was slightly if not completely crazy to either do one of two options: retreat and get assistance or go in guns blazing. I chose the latter and stealthfully walked into the area where they were being held and upon discovery wounded everyone who might actually be holding the key to the cells his comrades were locked in.
SO all our characters were conducted to a trial, where all our misdeeds were laid to bear. Now came the next option, deny everything, try to save myself or go crazy and make the court a three ring circus. In character I proceed to bellow and tell them that not even half the stuff they've talked about is what's written in the towns I've left behind and there will be even more when I'm free and that I was coming for the judge. Obviously the trial was just an act, they were going to try to execute our group anyway so we were lead to some sort of ring to be destroyed, but low and behold the DM either wanted an deus ex machia and had her NPC let her dragon companion assist us in our escape. I imagine it now like Drogon attacking the fighting pits in Game of Thrones. So my character made it back to the court room where the judge himself was hiding and in a term I can only use as Old Testament Style did I made good on my promise.
I know this sounds crazy and violent and all kinds of wrong, but much like Doom sometimes the ability to just cut loose and enjoy being someone who just wants to watch the world burn can be such a stress re-leaver in a controlled and structured environment and it was just fun to enjoy a good night with my friends until the late evening and discuss everything afterward with waffles.