A running gag on the show saw Kramer's entry hall change almost every time he opened the door, with the framed photo of Seinfeld seemingly part of the joke. Seinfeld went on to define a generation ...

Cosmo Kramer is under arrest! Nah, he’s not really the Smog Strangler, but the cops don’t know he’s not the real serial ...

And no episode would feel right unless Jerry’s neighbor Cosmo Kramer (Michael Richards…yeah, I know) busted through the front door with some hair-brained scheme. Without Seinfeld ...