I found it when I heard this tip from a sales workshop:
“If you can get a prospective customer to answer, ‘Yes,’ to any question you ask, you’re more likely to make the sale.
Annoying Salesperson: “Don’t you want to save money on your wireless service?”
Annoying Salesperson: “Don’t you want to pay less for your wireless service every month?”
(Obviously I didn’t understand the question the first time.)
Me: (In my most pleasant voice)
“No. I love my wireless provider. I consider the money I pay them every month to be a gift. I’d pay more if I could.
“Thank you, and have a nice day.”