Which Sinfeld was this fraze from? Need to watch this episode again!?

Today I saw the episode where George is obsessed with Bozo the Clown. George goes to the kid's birthday party and is talking to the clown about Bozo and the clown says he doesn't know him. George gets upset and the clown says, "You're living in the past, man. You're hung up on some clown from the 60's, man!!"