You knew it whenever Jerry would grimace and take on a gravelly tone as he uttered their names. They made Kramer twitch more than usual in repulsion, and George's pitch and decibel level raised with his anxiety. They were the Seinfeld "villains." Each threatened Jerry and his pals in different ways, each formidable. This article ranks their picks as to the top Seinfeld enemies. Do you agree? Speak up in the comments. But for now, be very afraid of one of my favorites: Philip Baker Hall as Lt. Joe Bookman, L.C. (Library Cop).