Why it worked
The video likely resonated due to its heartwarming display of kindness and generosity, which is a universally appealing theme. The "undercover" premise adds an element of surprise and intrigue, making the act of giving more impactful. The creator's focus on helping families during a "tough time" taps into a desire for positive social impact and shared humanity.
Summary
A person approaches a family outside a grocery store, initially asking to check their receipt as if they were a store employee. The family explains they don't work there, and the person reveals they are "undercover" and just want to help families. They then give the family money and a teddy bear, and offer further assistance.