I will not laugh

Customer: Do you have any psychic books for kids?
Me: Books about psychic children?
Customer: No books for kids.
Me: I'm not sure. I'll look.
Customer: I want to train my psychic 9 year old.
Me: Ummm OK.
Customer: You know. So she can use her powers.
Me: Ummm OK.
Customer: 'cause she's psychic.
Me: Ummm OK.


I KNOW I sounded like a customer - repeating myself over and over but what do you say to that?