Hammer [Groucho Marx]: ... Now here is a little peninsula, and here is a viaduct leading over to the mainland.
Chico: Why a duck?
Hammer: I'm all right. How are you? I say here is a little peninsula, and here's a viaduct leading over to the mainland.
Chico: All right. Why a duck?
Hammer: I'm not playing Ask-Me-Another. I say, that's a viaduct.
Chico: All right. Why a duck? Why a--- why a duck? Why-a-no-chicken?
Hammer: I don't know why-a-no-chicken. I'm a stranger here myself. All I know is that it's a viaduct. You try to cross over there a chicken, and you'll find out why a duck. It's deep water, that's viaduct.
Hammer: Look ... Suppose you were out horseback riding and you came to that stream and wanted to ford over there, you couldn't make it. Too deep.
Chico: But what do you want with a Ford when you gotta horse?
Hammer: Well, I'm sorry the matter even came up. All I know is that it's a viaduct.
Chico: Now look ... all righta ... I catcha on to why-a-horse, why-a-chicken, why-a-this, why-a-that. I no catch on to why-a-duck.
Hammer: I was only fooling. I was only fooling. They're going to build a tunnel in the morning. Now, is that clear to you?
Chico: Yes. Everything---excepta why a duck.