Season 8, Episode 2: "The Soul Mate"

It's by an unknown 20th century poet.

- Oh, what's him name? - Newman.

Elaine, you changed my life.

Oh, Kevin, you can go on and on about how you don't want kids...

...and it sounds-- It sounds really nice...

...but the truth is, I don't know if you mean it or not.

I got a vasectomy this morning.

Although, I have a hunch you mean it.