Hidden cameras have captured all sorts of bad behavior in classic ads—from shoplifting to burger freakouts. But here’s one campaign that’s more upbeat.

McDonald’s Colombia installed cameras on the caps of its delivery employees and had them secretly take photos of customers at the moment of delivery—to promote a new and exclusive home delivery service through its own team of employees.

The results are charming and capture what McDonald’s calls “happy chaos.”

“This initiative allowed us to demonstrate that sometimes happiness only takes a second to appear,” says the agency, DDB. 

The crew took hundreds of photos of different people in their homes and workplaces and used the best ones for the campaign—with the customers’ permission, of course.