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 killer. That’s Tobias Lehigh Nagy, the guy who the police pick up for breaking into a car. The thief shares a backseat in the squad car with Jerry and George, who are trying to prove Kramer’s innocence. And thanks to Jerry and George forgetting to close the door on the police car, the real Smog Strangler gets away.

Clint Howard, brother of director and sitcom royalty Ron Howard, is convincingly creepy as Nagy. And he had a charmed day of filming Seinfeld, he told People. Why was his experience better than any other? Howard revealed why the cast was in an especially good mood that day.

“The day that I did ‘The Smog Strangler’ — the one day that I worked on Seinfeld — it...