Reality TV star Jenelle Evans has been filmed pulling a handgun on a driver in front of her son as MTV's cameras rolled on her show Teen Mom.
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The footage shows the road rage incident took place after Evans was allegedly tail-gated by a male driver.
"Are you f**cking kidding me, dude?" she yells, before instructing her eight-year-old son Jace to pass her his cell phone so she can call the police.
"He races in front of me, and purposely slams on the brakes at 70-something miles an hour," she then tells the 911 operator.
Evans appears to be fighting back tears as she explains, "I almost got veered off the side of the road."
TMZ reports the other driver involved claims Evans followed him to his house, where the confrontation continued.
MTV's footage shows Jace telling his mother, "If he tries to get out and hurt you, I can grab this NERF gun and whip him," referring to his toy pistol.
The clip then shows Evan screaming, "He just hit my car!" as she collides with the ute, before reaching for a real gun she has stashed beside her.
MTV did not air the rest of the footage, cutting to titles that read: "At this point, Jenelle pulled out her firearm."
Police reportedly arrived on the scene, but no arrests were made.