Who's on first?

Last night as Paul was looking through 7-year-old Ethan's school papers:

Paul: Ethan? Where is the classroom contract you are supposed to get signed for your teacher?

Ethan: Oh yeah... Mom needs to sign it too.

Paul: Okay - where is it?

Ethan: Where is what?

Paul: The contract we are supposed to sign.

Ethan: I don't know.

Me: You took it from me, remember? After we got out of the car?

Ethan: Oh...

Paul: Will you go get it please?

Ethan: Get what?

Paul: The contract.

Ethan: What contract?

Paul: The contract we are talking about.

pause

Ethan: What are we talking about again?