It happened in Dallas, and police say the suspect ran away from the scene.
The driver who was hit was just 16 years old. Even though it was the driver of the other car who walked away from the scene, police say it appears the teen driver may have been at fault.
Clev Jones was startled around 3:30 Monday morning by a boom so loud he thought it was much more than a car wreck.
"I thought it was a train like connecting to another train," said Jones. "That's what I thought it was. And I came out here and saw the police and helicopter and everything."
What he discovered was two cars two blocks away, smashed near the intersection of Singleton Boulevard and Vilbig Road in west Dallas.
Good Samaritans were trying to free a 16-year-old behind the wheel of a gold Saturn.
Police say it appears the Saturn was going westbound on Singleton in the right-hand lane. Several teens were reportedly in the car.
It suddenly attempted to make a U-turn and crossed into the path of a Mitsubishi.
The Mitsubishi broadsided the Saturn, and the driver's side took the brunt of the impact.
"Somebody was flying," said Jones. "That's what they was doing. Somebody was moving pretty fast."
Those who saw it unfold say the Mitsubishi hit the Saturn so hard, it dragged the car about halfway down the next block of Singleton Boulevard.
Witnesses say one uninjured passenger told them the teen driver had just gotten the car.
The driver of the Mitsubishi appeared to be unconscious after the crash and then came to.
"[The driver] jumped up and left," said Jones.
The next time they saw him, he was running away, carrying his shoes.
Good Samaritans worked to save the teen driver, who was eventually freed.
"They didn't think he was going to make it, and they was asking us do we know who he was, and I don't know," said Jones.
That suspect hasn't been seen since, but his vehicle was left behind and police are processing it for clues.
Police say the teen driver was transported to a nearby hospital.
At last check, he had not been positively identified.