Quote from Kramer in The Strongbox
Jerry: Kramer, they think I killed Fredo! And who buries a bird? Kramer: Yeah. Just give it to the Portuguese guy, and he puts it in the incinerator. Jerry: Just get the key and let's get out here. Kramer: You know, it's a funny thing about that bird dying. I hid the key in Fredo's food dish. Whew! That's a weird coincidence. Jerry: Kramer!? Kramer: What? Jerry: You killed Fredo! Kramer: Fredo was weak and stupid. He shouldn't have eaten that key.