I did a job with some randoms, after the job one of them decides to shoot me in the back. He instantly starts a new job.
I HATE players who randomly kill you with a passion, so I went in to teach him a lesson. (Normally I would just kill him like ten times until he'd leave). We started the mission just the two of us, I let him in my car then kicked him out in the freaking mountains.
After he ran all the way to the road I kept running him over until he died. He then stole a car and started throwing sticky bombs at me. Friendly fire is turned off during missions, so he'd just detonate them and nothing would happen. As he drove with high speeds to get away from me, he crashed into a wall and I boxed him in, pressing in the gas so he couldn't get out. He then had to admire my blue tire smoke filling the screen and musical horn playing over and over and over. He finally got sick of it, threw a sticky bomb at the hood of my car and detonated it, causing his vehicle to blow up with him in it.
I then got out of the car and made him watch me doing some gestures for a few minutes, then I completed the mission.
The best part?
After the mission: "You've received 1000 for being a good sport!"