Not A Very Smart Cookie

(A customer is standing in the store looking at the case of pastries.)

Customer: “What’s a peanut butter cookie?”

Me: “It’s a cookie with peanut butter.”

Customer: “What’s a chocolate chip cookie?”

Me: “It’s a cookie with chocolate chips in it.”

Customer: “What’s the difference?”

Me: “The peanut butter cookie has peanut butter and no chocolate chips, and the chocolate chip cookie has chocolate chips and no peanut butter.”

Customer: “I don’t understand the difference.” *deliberates for a few minutes* “I’ll get one of each…”