Daily Flash Fiction Challenge

After the seven of us finished our last class for the semester, we decided we'd have a good time together. So we went to Jason's house and opened some beers, but since we were afraid we'd get caught we didn't manage to get properly drunk. And that was how Kevin had the idea of surfing down Turtle Creek. "It's not too far away, and it goes on and on forever. And it's in the country, so there aren't a lot of people to bother you."
We took two cars. Jason drove the first one, an old Cherokee with a dented bumper and a rack on top. The second car, a Taurus with more miles than lay between the Atlantic and Mississippi, belonged to Kevin. When we got to Turtle Creek, we flipped coins about who rode on top first. Tom and Jim's coins came up lucky, so the rest of us got back into the cars while they got ready. Jim clambered up the Taurus' hood, holding on to where it dropped to the wipers. Tom, however, straddled the Jeep, gripping the racks to his sides and wedging his feet in. "I'm probably going to regret this, but we all have the right to be stupid sometimes," he said.
The first part of the ride went well. Squealing with delight, Tom and Jim held on for dear life, while Jason and Kevin drove as fast as they dared. But then there was trouble. Strange headlights peered up the road. Kevin rolled down the window and hollered to Jason up ahead. "Watch out, someone's coming!" Startled, Jason slammed on the brakes. Behind us we heard a yell and a thump, then a second yell and thump.