Jack says....

Jack, after working hard to get his shark costume on, "I got my shark jacket on. Now I'm a dolphin! Dolphins have bums." And then he walked away.

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Jack, "I want to go to the doctor to get a robot in my mouth."
Me: "What?"
Jack: "Daniel has a robot in his mouth. I want to go to the doctor to get a robot in my  mouth."

Daniel has a palate expander in the roof of his mouth. It looks like this:

I guess to Jack, it's a robot!