Birds don't use potties, so there's no potties in trees.

Alex (to Mommy): I was gonna say something to you but I forgot.


Alex: Daddy, how do you build trucks? Because trucks build things. With them.
Daddy: I don’t know! How do you build tools?

Alex: Maybe there's a special kind of tool, you don't have to build. It builds itself.

Alex: Birds don't use potties, so there's no potties in trees.