House of 1000 Corpses, a film by Rob Zombie.
This movie is the first part of a two part story about a group of 4 kids out on a road trip, looking for Dr. Satan, and a family of strange locals who are more than happy to tell them everything they'd ever want to know about Dr. Satan, and so much more.
Rob Zombie has done amazingly well on this movie considering all its setbacks, the movie had a hard time with production, nobody wanted to take it, somone finally did and it turned out amazingly.
The movie starts out with the 4 teens on the road trip, looking for strange things to report about. they find a museum and gas station and learn of Dr. Satan on the murder ride. The gas station clerk tells them how to find the tree from which Dr. Satan hung, and their met by a pretty young hitch hiker on the way, who leads them back to her house when their car breaks down. there they meet the FireFly Family.