A Misunderstanding Of Pi

Me: “Hello, can I help you?”

Customer: “Yeah, I’d like a large pepperoni pie and a bottle of [soda] delivered to [address].”

Me: “Okay, your total is ***. That’ll be about a half hour. Is that all?”

Customer: “Oh, also, how much extra would it cost to have my pie be 16 slices instead of 8? Because I’m really hungry tonight.”