Halfway through a performance of 'Who Knew' Sunday night, Pink stopped her Truth About Love Tour stop to read the audience the riot act.  It all started when the singer spotted a crying little girl in the crowd at Wells Fargo Center.

When Pink asked the girl why she was shedding tears, the child responded that people were fighting in her section of the venue.  That's the moment the Philly native chose to teach her concertgoers a lesson.  Check out the video!