Impulse

“The madness inside us all.”

A small earthquake shakes a quiet rural town, and afterward its residents start behaving in ways no one can explain, turning violent and hurting themselves. Stuart (Tim Matheson) and Jennifer (Meg Tilly) watch their neighbors change and try to work out what the quake disturbed, while Graham Baker keeps the town small enough that every face is one they know. The longer they wait, the fewer people are left who still seem like themselves.