There is a joke about what pig A is called and what pig B is called, and then it makes the wolf angry. What kind of joke is this?

Three little pigs, who is pig A, where is pig B and what is pig C? One day, pig a and

Pig is at the door, and pig C is on the roof. A wolf found them and wanted to eat them, so he rushed to pig A. ...

Wolf: Who are you?

Pig A: Yes!

Wolf: What?

Pig A: What's on the roof?

Wolf: I mean what's your name?

Pig A: Who's my name and what's on the roof?

The wolf asked pig B again.

Wolf: Who are you?

Pig B: Who am I? (Pointing to pig A)

Wolf: You know what?

Pig B: Hmm.

Wolf: Who is it?

Pig B: Yes.

Wolf: What?

Pig B: What's on the roof?

Wolf: Where?

Pig B: Where am I?

Wolf: Who?

Pig B: Who is it? (pointing to pig head a again)

Wolf: How should I know?

Pig B: Who are you looking for?

Wolf: What?

Pig B: On the roof.

Wolf: Where?

Pig B: It's me.

Wolf: Who?

Pig B: I'm not who, but who.

Wolf: Good heavens!

Pig A Pig B: "My God" is our father.

Wolf: What, it's your father?

Pig B: No.

The wolf couldn't stand it any longer and sighed, "Why?"

Pig ABC: Do you know our grandfather?

Wolf: What?

Pig A: No, why our grandfather.

Wolf: Why?

Pig A: Yes!

Wolf: What's this?

Pig A: No, it's why.

Wolf: Who?

Pig A: Who am I?

Wolf: Who are you?

Pig A: Yes, who am I?

Wolf: What?

Pig AB: On the roof.

……

Finally, the wolf committed suicide.