Story highlights Waiter Kasey Simmons paid for a woman's groceries

The woman's daughter later left him a $500 tip

(CNN) Kasey Simmons loves to make people smile. But Tuesday, the 32-year-old waiter was the one beaming.

A customer at the Dallas-area Applebee's restaurant where he works left him an unforgettable tip.

"They ordered the cheapest thing on the menu," Simmons said. "Flavored water."

The total bill was $0.37. The tip was $500. A note, written on a napkin explained why.

A day earlier, Simmons was shopping at his local grocery store. In the checkout line, he noticed another shopper, an older woman who was clearly despondent.

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