TV Quote from Seinfeld 09x03: The Serenity Now

Frank: Serenity now! Serenity now!
George: What is that?
Frank: The doctor gave me a relaxation cassette. When my blood pressure gets too high, the man on the tape tells me to say 'serenity now!'
George: Are you supposed to yell it?
Frank: The man on the tape wasn't specific.