In May of 1925, a freight train traveling from Tamaqua to Williamsport derailed while crossing the railroad bridge over the Susquehanna River in Sunbury. The contents of the freight cars-- including six tons of chocolate bars-- spilled into the river. Children wasted no time plunging into the water in hopes of "rescuing" the chocolate. Although the accident caused thousands of dollars worth of damage to the bridge and train, no injuries were reported, perhaps making this incident the happiest trainwreck in history!
From the Altoona Tribune, May 28, 1925: