82. Mr. Heyman
Best-known episode: "The Library"
Most folks would observe a homeless man doing calesthenics on the steps of the New York Public Library and see nothing but a person who fell on hard times. If you're George Costanza, however, you recognize that, beneath the craziness and filth, is the gym teacher who made your high school years a living hell. Back in the day, Mr. Heyman used to torment the young George, calling him "Can't-Stand-Ya" and organzing massive atomic wedgies administered by his athletic toadies. These antics — along with George "tattling" on him — got the coach fired, resulting in a downward spiral for Heyman. But the former teacher has the last laugh, both metaphorically (guess who has that missing copy of Tropic of Cancer?) and literally. DAVID FEAR