Encounter with the Unknown (1975)

Three eerie tales based on actual events are enacted in this film First three college students play a prank on a geeky classmate who is accidentally shot and killed His vengeful mother forecasts the deaths of the three young men she holds responsible on 7 14 and 21 days hence And one by one her grim predictions come true Next a ghoulish sound emanates from a mistshrouded hole in the Earth near where a Missouri boy has lost his dog The boys father is lowered into the hole and lets out an agonizing scream Finally a senator returning home from a party finds a lost girl on a bridge and learns from her father that she died years earlier