What is the purpose of your visit?

Captain Haddock arrives at JFK.

...

Official: What is the purpose of your visit?

Haddock: To visit Washington.

Official: Where will you stay?

Haddock: At the Petit Chat.

Official: When will you leave?

Haddock: In a week.

Official: Why have you come here?

Haddock: You already asked me that.

Official: Be careful smartass. Lip like that could land you in jail.

...