From Gizmodo: "Why did this boy end up strip searched at airport security?"

Story in a nut shell: Kid sets off metal detector, TSA wants to search his hoodie/shirt. Dad, upset, takes kid's shirt off at which point the TSA dramatize the search for a few moments, then has dad put shirt back on.

The continued story is that the guy filming it was approached afterward by a TSA Suit who demanded he delete the video. He refused to comply and now it's up on YouTube.