Two Daviess County 16-year-olds were killed Friday morning after being ejected from their vehicle in an accident on State Road 257.  According to officials, Zachery Blubaum had pulled his vehicle into a path of a semi grain truck, killing both him and his passenger, Derek Arvin.  The driver of the semi, Jerrald Berry of Decker was flown to Evansville for treatment of head injuries.