Season 6, Episode 23: "The Face Painter"

Then someone tells me that he did it.

Well, I pick up the banana peel...

...and I wait for that monkey to turn around, and then I:

I let him have it.

Kramer, you threw a banana peel at a monkey?

Well, he started it!

-It's a monkey, Kramer! -Well, he pushed my buttons.

I couldn't help it, Jerry.