on this night, spectators were left scared, scarred, and wanting to know what went wrong. in southeastern pennsylvania, a holiday celebration goes from festive to fearsome in the blink of an eye. >> oh, my god. >> what the -- what the -- >> july 4th, 2010, the town is celebrating more than american independence. the 7,000 residents are also celebrating their hometown's big birthday. lifelong natives look forward to the evening festivities. palmyra was celebrating and it was a big deal for the community. they had vendors set up, rides set up, things for the kids to do and the adults to do. >> the night will be topped off by a fireworks display at the