Why do sports fans sometimes (often?) go crazy at sporting events and then afterwards proceed with their day as if nothing much happened? If something of genuine significance happened, something that warranted the emotional ups and downs the fan experienced during the game, why don’t its effects linger? These questions pose a version of the puzzle of sports fandom. Others have applied Kendall Walton’s theory of fiction to solve the puzzle, but Walton’s account of sports fandom fiction is unacceptably thin. (...) Recent attempts by Nathan Wildman and Joseph Moore to address this thinness problem fail. We answer the thinness objection by explaining how sports fandom is a collaboratively authored fiction, constructed by fans, sponsors, players, teams, media commentators, and more. The stories of sports fandom fiction are passed to new generations of fans in a way more reminiscent of The Iliad or The Romance of the Three Kingdoms. Sports fandom fiction is more like folklore, and less like a novel. (shrink)