People can be grumpy before their morning brew, but that's no excuse for a lack of courtesy.

A coffee shop in Roanoke, Virginia, has a tongue-in-cheek sign out front offering tiered coffee pricing based on the level of politeness offered by customers.

Order "one small coffee"? That'll be $5.

Ask for, "One small coffee, please”? Your cost is $3.

Go all out and say, “Hello, I’d like one small coffee, please"? Your bill drops to $1.75.

Austin Simms, the barista at Cups Coffee & Tea who wrote the sign, explained the motivation behind his idea to WDBJ.

“I decided because I need to solve all the injustices of the world to start charging more for people who didn’t take the time to say hello and connect and realize we’re all people behind the counter,” Simms said, laughing.

Besides making it on the local news, the sign has sparked media interest around the nation and the world. It was popular on Reddit, was featured in a British newspaper, and has been picked up by TV stations and media outlets all over the country.

And people are definitely more courteous when they come in, and they often laugh when they order, owner Olivia Byrd tells MNN.

"They come in and after they've seen the sign, they've got a big smile on their face," she says. "With everything that's going on in the world, they say let's all laugh about something."

Mary Jo DiLonardo Mary Jo writes about everything from health to parenting — and anything that helps explain why her dog does what he does.