From the Williamsport Sun-Gazette: Residents from Lock Haven to Williamsport, Rauchtown to Avis report hearing a "big boom" earlier this week. It was heard at about 9:30 p.m. Tuesday May 18th. Some say the noise was reminiscent of a sonic boom heard in July 2001 when a meteor crashed into a cornfield near Williamsport. Local officials have no explanations for the noise.
I think what they heard was the end of a certain U.S. Senate career.