A small-town cop gets a taser gun in case of a riot. His waitress asks about the odds of a riot breaking out and the cop’s partner responds with an innumerate answer. The answer of 50/50 implies it’s just as likely as not to have a riot in the town of Dog River. In this rural setting, it’s way more likely NOT to have a riot. It’s almost like asking what’s the probability of rolling a 3 on a 6-sided die and someone answering 50/50: either you roll a 3 or you don’t. We know that answer should be 1/6 because either you roll a 3 or you don’t and the don’t includes rolling a 1,2,4,5, or 6. It’s much more likely not to roll a 3 so the size of the set (a 3 or a riot) is much smaller than its complement.