I have a coworker who out of the blue asked me whether I preferred a trackball to a mouse. “Yes, actually, this is the only place I use a mouse. I have trackballs at home.” He explained that he has a supernatural ability to identify trackball users, and that he has no idea how or why, but he is almost always right. We all proclaimed our astonishment and amazement, and then I said, “Wow, what an insanely useless superpower,” and he was utterly crushed and saddened, whereupon we determined that my superpower was raining on people’s parades. True story.