What question is its own answer?

Person 2: I'm bored.

Person 1: What do you want to do?

Person 2: I don't know, what do you want to do?

Person 1: I don't know, what do you want to do?*

Person 2: Let's go to the theater.

Person 1: OK

(Person 1 and Person 2 are seen going to the theater)

*The answer is of course "I don't know, what do you want to do?"