Sweet Sixteen (1983)

Big city girl Melissa's family moves to the small town where her Mom grew up and everyone she dates end up dead.  Her archaeologist father can vouch for her whereabouts after the first death. But at the second, Melissa says an old Indian was in the alley behind the bar where the killing took place. This gives the racists in town a perfect chance to exact some vigilante justice.

The family has a big party for Melissa's sixteenth birthday, and the Sheriff's son decides he's interested in her. You'd think he'd be too afraid to get near her due to the other boys deaths. Also she's not the friendliest person until a personality change comes out of nowhere. I'd guess things aren't going to go as planned at the party.

Using powers of deduction, you won't be all that surprised at who the killer is, but you will be disappointed that entering an Indian burial ground to go parking results in nothing other than a scare.  The film has Larry Storch as the bartender and Patrick MacNee as Melissa's father.

Ridiculous dialogue:

Johnny: Maybe you'd like to go for a ride.
Melissa: Maybe I would.
Johnny: I'm Johnny and this is my truck.