I just got done watching Steven Spielberg's Duel, which inspired my asking of this question.
There are many to choose from. You've got Joy Ride, Death Proof, Christine, The Car, and maybe a few others I can't think of offhand. Does The Hitcher count...?
My personal choice would be Super Hybrid. I'm not saying it's a great film - quite the opposite. But its utter strangeness makes it a top notch guilty pleasure.
Duel was chilling. I never looked at a big rig the same again. LOL
Christine. No contest. :-)
It was a movie about an 18-wheeler terrorizing a man in a car out in a deserted area. It was scarry to me. I don't remember the name of it.