Parrot see joke

A man bought a parrot and taught it many times at home, but the parrot only said,' Who is it?

The next day, the man went out and a stranger knocked at the door.

Parrot: Who is it?

Stranger: Gas inspector.

Parrot: Who is it?

Stranger: Gas inspector.

Parrot: Who is it?

Stranger: Gas inspector.

Parrot: Who is it?

Stranger: Gas inspector.

Parrot: Who is it?

Stranger: Gas inspector.

Parrot: Who is it?

Stranger: Gas inspector.

Parrot: Who is it?

Stranger: Gas inspector.

Parrot: Who is it?

Stranger: Gas inspector.

Parrot: Who is it?

Stranger: Gas inspector.

Parrot: Who is it?

Stranger: Gas inspector.

Parrot: Who is it?

Stranger: Gas inspector.

Parrot: Who is it?

Stranger: Gas inspector.

In the evening, when the master came back, he saw a man lying at the door and asked, who is it?

At this time, the parrot said, the gas inspector.