Keith Hernandez in "Seinfeld"
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In his arc on two-part episode “The Boyfriend,” Keith and Jerry become friends when the 1979 NL MVP tells the comedian he’s a fan, to the disbelief of George. But Jerry gets jealous when Keith starts dating Elaine and spending more time with her. Illustrated by a “JFK” spoof, Kramer and Newman accuse Keith of spitting on them at a past Mets game, but the first baseman unveils the real culprit: Mets teammate Roger McDowell, or the “second spitter.”