Authorities across the Philadelphia region are warning residents about a viral social media challenge in which people kick or pound on front doors, often late at night while homeowners are asleep. Residents in communities including Montgomery County's King of Prussia and Royersford have been posting videos of the incidents online while also reporting them to police. While many residents have been sharing images of suspected pranksters on social media, police are asking people to contact law enforcement first. "If you think these challenges are harmless, think again," the King of Prussia resident said. AI tools helped convert the story to a digital article, and an NBC Philadelphia journalist edited the article for publication.