Season 9, Episode 18: "The Frogger"

-Elaine, cake? -Oh, no thanks.

It's Walter's special day.

There are 200 people who work in this office.

Every day is somebody's special day.

Elaine, where you going?

It's Walter's last day. We have to celebrate.

It's his birthday and it's his last day?

This is other Walter from returns.