At Rosa’s Fresh Pizza in Philadelphia, a slice is always a dollar, but not everyone pays, thanks to the generosity of customers who “pay it forward,” buying a slice or two for someone in need.

According to 6abc.com, the concept is so popular, and people are paying it forward in such a big way, they are feeding thousands, with at least 8,000 slices feeding the hungry so far.

Owner Mason Wartman, pictured at left making a pizza, left his finance job last year in New York City and moved back home to open the pizzeria he named after his mother. The charity initiative started with the good will of one customer.

Read more about how paying pizza forward is making the hard streets of Philly a little friendlier.