Hernandez guest-starred as himself in "The Boyfriend", a two-part 1992 episode of the sitcom "Seinfeld". In the episode, Hernandez dates Julia Louis-Dreyfus's character Elaine Benes, and Jerry Seinfeld develops the male-bonding equivalent of a crush on him. A subplot of the episode is a parody of the movie "JFK" and the "Magic Bullet Theory" featured in it. According to the show, on June 14, 1987, the Mets were playing the Philadelphia Phillies at Shea Stadium, and Hernandez committed an error in the ninth inning, allowing the Phillies to score five runs and costing the Mets the game (in reality, the Mets defeated the Pittsburgh Pirates on the road on that date; Hernandez played, but did not commit an error). Hernandez exited the players' gate, where Kramer and Newman were waiting, and Newman heckled Hernandez. Kramer and Newman then spent the next five years claiming that Hernandez had spat on them, when in fact it was Roger McDowell. Hernandez also appeared in the final episode of "Seinfeld", which aired in 1998. Hernandez makes about $3,000 a year in royalties from the show as of 2015. ESPN columnist Bill Simmons coined the phrase "having a Keith Hernandez Moment" about the point in Hernandez's "Seinfeld" appearance where he recovers from a moment of self-doubt by simply reminding himself: "I'm Keith Hernandez!" The "I'm Keith Hernandez" quote became the title of Hernandez's fifth book two decades after the Seinfeld episode aired.