Here's a great "pay it forward" story from Fox and Friends, featuring a South Dakota woman who bought three boxes of diapers for a young mother at her local Walmart. The random good deed was recorded by another shopper in the line, who then posted it on Facebook.

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As it turns out, Carol Flynn, 73, went viral.

"I found out what that meant," she joked on the couch this morning, going on to tell the heartwarming story.

The mother had picked out four boxes of diapers, but learned that the store's "price match" offer only applied to one box, so she was set to leave without the other three.

"I just went over and got the diapers and put them in her cart. And she said, you don't have to do this. I said, yeah I do," Flynn recounted. The extra diapers cost Flynn $120, but she said in the Sioux Falls area "we all know each other."

Flynn explained that she's a retired March of Dimes worker and said the organization's goal is helping mothers and children.

"I thought, 'I'm not wealthy, but I can do this.'"

Then we heard by phone from Katie Kanefke, the young mom who was helped by Flynn. She called Flynn a "great lady" who did an "awesome" thing. Kanefke and her husband are supporting their four-month-old son on a single income.

Flynn said she had no idea anyone had seen what she did until the local paper called her a few days later.

Watch the full interview above.

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