Season 6, Episode 8: "The Mom And Pop Store"

Why? Why is it impossible? I mean, they're both bite marks.

You're showing up at that party with a chewed-up pencil...

...and Kramer's gnarled arm?

-It's worth a shot. -Yeah.

Kramer, you wanna go to the party together?

Jerry, look, come on, I'm an invited guest.

I can't be aiding and abetting some party crasher.