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I created this Sporcle quiz using the power of College Football Reference and my own sad, twisted curiosity. It turns out Kirk Ferentz has lost to a wide variety of coaches. Some of them have won national championships, some of them never finished a season with more than seven wins, and one of them was an interim coach. We encourage you to see just how many Ferentzslayers you can name, and then feel a little sick when you see how many others are out there.