You're likely going to end up with a smashed in rear and a shocked girlfriend.
Most of the road rage videos we watch day in and day out, typically feature two men who have jumped straight into some altercation that spins wildly out of control, likely because of testosterone and ego getting the best of them. Every now and then we come across a video of a woman who manages to lose control and gets in the face of another while their significant other casually watches from the driver's seat.
Most of us who have driven with our wives and girlfriends know better than to let something like that happen. After all, we will be the ones left to clean up the mess. Exactly the lesson this guy learned from his "classy" girlfriend and another driver that clearly didn't give two f*cks about her.