I've always used my mouse left-handed. And I don't even reverse the keys. So I feel like every time I click on something, I'm giving the finger to the right-handed world. It's a nice morale booster. I also tend to leave the mouse on the left side of the computer. Hey, if I have to move the mouse every time I use a computer somewhere, the rest of the world should have to move it back! Sure, I might sound like a jerk, but hey, enjoy that little taste of my everyday life, righties!
And left-handed scissors are the worst! By the end of kindergarten I had learned that those special scissors would do nothing except mangle and fold the paper I was trying to cut. And even worse, they all had brightly colored handles, almost as if the manufacturers wanted to make sure everyone could tell that you were a lefty, just to set you completely apart. Because of all that, I use scissors right-handed. There's just no other way to do it. The world will have a cure for cancer and personal jetpacks before finally breaking the technology that will allow left-handed scissors to actually work.