Scarier still was Race with the Devil with Peter Fonda, Warren Oates and Loretta Swit.
Also, I remember a TV movie from childhood that wasn't scary but very creepy. And I don't know the name of it. A teenage kid kills another kid and his mom hides him from the law by creating a room for him behind a false wall. The kid's an artist and draws all day but goes crazy from the solitude.
Does this ring any bells for anyone?