Dash camera video from the car behind caught the exchange on tape.
For an unknown reason, on southbound 75 on Wednesday afternoon, a black Nissan Altima and a silver Dodge Ram went back and forth, almost egging each other on.
First, the Altima is behind; then the truck darts in front.
The Altima won't back off and let the truck in, so the two vehicles nearly collide.
Seconds later, the barrel of a gun is sticking out of the truck's window.
The driver of the pickup could face two aggravated assault charges, which are both second degree felonies.
However, no one called 911, so at this point there is no victim, and Dallas police aren't pursuing the pickup driver.