MINNEAPOLIS (WCCO) — A birthday gift for a grandmother is stirring quite the buzz at one downtown Minneapolis coffee shop.

A regular customer walked into a Caribou in downtown Minneapolis two weeks ago, and it became a moment Angela Sanders will never forget.

Through the month of October, Caribou is asking customers if they want to buy a bag of coffee — they are beans that Caribou will hand-deliver to charity.

Sanders decided to personalize the cause by posting a sign by the register during her shift.

“Help me celebrate my wonderful grandma,” Sanders said. “She is one of the strongest women I know. A breast cancer survivor and celebrating her 90th birthday this week, which was on Oct. 3.”

To pay tribute to the two-time breast cancer survivor, Sanders came up with a plan to sell 90 pounds in one shift for her grandmother’s for 90 years.

One of her regular customers made it happen all by himself.

“He’s like, ‘What are you at right now?’ And I’m like, I’m at 10 pounds, 80 more to go,” she said. “He just kind of looks at me and he’s like, ‘Put me down for the rest.’ I was like, ‘Really?'”

Speechless, Sanders thought of another way to show gratitude

“I’m like is it OK if I give you a hug? And he’s like ‘Yeah, that’s OK,'” she said.

Gratitude that she’s since found has renewed her faith in strangers.

The customer has chosen to stay anonymous, and word is he’s sending 40 pounds to the U of M Breast Cancer Research Center, and donating the other half to a charity of his choice.

Sanders ended up selling more than 100 pounds of coffee that day, a record for Caribou baristas.