The Whole Is Less Than The Sum Of Its Pits

(I’m working at the checkout and have just weighed several peaches for a customer.)

Customer: “Oh, wait, sorry… I have one more peach to weigh. Have you already weighed the others?”

Me: “Yeah, but that’s okay. I’ll just weigh it separately.”

Customer: “No, that’s not okay!”

Me: “Why not?”

Customer: “Because they would have weighed differently if they were put together. It would be less!”

Me: *speechless*