What if, in hypothetical two-way races during the 2020 primaries, Biden beats Sanders, Sanders beats Warren, and Warren beats Biden? Is this even possible? (Yes.) What would then be a fair way to decide the "best" preferences of Democrats? Whether it's a T-shirt design contest or a presidential election, voting converts preferences of individuals into a single preference for the community. We'll discuss Arrow's Impossibility Theorem, which states that there is no "perfect" way of doing so. We'll demonstrate a few of the mind-boggling flaws that every voting method must have.