I Saw What You Did (1988)

Michael A. Ross, Candace Cameron Bure, Shawnee Smith, David Carradine

Two teens, Lisa and Kim, are playing games making prank calls on the phone. But when they call Adrian Lancer who has some mental problems, and say "I saw what you did", they ignite a human time bomb. Adrian has just killed someone and thinks they saw him do it. Now he is trying to find them. ?Brian