A teen is seriously hurt in a Utility Terrain Vehicle crash in Mercer County Saturday night.  17-year-old Jacob Dahlinghaus of Tipp City was found in a corn field near the intersection of Huwer and Homan Roads around 7:30 p.m.  He was taken to the Miami Valley Hospital by helicopter with serious injuries.  According to Mercer County deputies, family members were concerned when Dahlinghaus didn't return from taking the UTV out for a ride and called the sheriff's office.   While responding to that call, another call came in about an injury accident where the driver was ejected from a UTVand was lying in a field.  The incident remains under investigation.