A cafe in Virginia has come up with an ingenious new strategy to convince customers to be more polite.
The business offers financial rewards to those who mind their p's and q's.
A sign outside the establishment advertises different costs for a cup of coffee depending on how courteous the customer is when ordering.
The prices are listed with the typical phrases a patron might use when placing their order.
They include: 'Small coffee' at $5 (£3.85), 'small coffee please' at $3 (£2.30) and 'hello, one small coffee please' at $1.75 (£1.35).
A passer-by took a photo of the directive and posted the image on Reddit with the caption: 'Sign at a local coffee shop.'
This isn't the first time that a coffee shop has attempted to teach customers a lesson.
A store in the south of France incentivised patrons a few years ago with a pricing scale.
The Petite Syrah café in Nice, on the French Riviera, charged customers €7 (£5.96) for 'a coffee', but a more affordable €4.25 (£3.62) for a 'a coffee please'.
Fabrice Pepino, manager of the Petite Syrah, said of the rationale: 'It started as a joke because at lunchtime people would come in very stressed and were sometimes rude to us when they ordered a coffee.'
He added: 'I know people say that French service can be rude but it's also true that customers can be rude when they’re busy.'
The American cafe will be hoping to following in the footsteps of the Nice trailblazer as the original coffee shop proved a success in changing customer behaviour.
Pepino said that he had noticed a marked difference in the behaviour of his customers after a few days of the sign being on show.
p's and q's: 恰当的举止