We've mentioned before—notably in last summer's Panera case—how random acts of kindness in customer service can snowball into massively positive PR when the customer involved relates the story poignantly through social media. The latest example comes from Midvale, Utah, where a server and manager at a Chili's restaurant thoughtfully helped out with a mini crisis involving a woman and her 7-year-old sister who has autism. The short story is: The sister refused to eat her burger, which had been cut in half, because she thought it was "broken." The server, in a remarkably compassionate way, offered to made her a new one—and the girl then kissed the new burger repeatedly when it arrived. It's a simple story, but one that the woman, Anna Kaye MacLean, tells evocatively in her post on Chili's Facebook wall. (See the full text below.) Now, Anna's accompanying photo of her sister kissing the burger has gone viral, with three-quarters of a million likes and more than 40,000 comments. Brands can't manufacture or even really plan for this stuff—that's what makes it so sharable—but it's always a joy when it happens. Via Mashable.