Usually something very bad.
Here’s the most obvious thing you’ll read all day: Drag racing is dangerous. While driving a car in a straight line sounds easy things get complicated when you throw in tons of horsepower and nitrous tanks. Things get even more dangerous when the wheels lock and both your front tires blow (while the nitrous is still running). Yup, that’s exactly what happens in this video. Fortunately what you’re about to watch isn’t a crash video, so don’t fret on that front.
Driver Tim Albright somehow keeps his Chevelle on the track and off the guardrail as it slows to a halt. Folks, this is why dragsters pack parachutes.