A couple of nights ago, I waited for a low level player to bring the high priority vehicule to Simeon' garage at the docks. As I did countless times before, I kill him, take the car, drive it to the garage and took the reward.
Instead of just leaving the area, I decided to mess with him so I enabled passive mode. He respawned nearby, grabbed a car and came looking for some revenge. the next 10 minutes were the most fun I ever had in GTAO.
I go across the street from the garage door and hide behind the concrete wall. The other guy gets out of his car and starts wasting hundreds of ammo on me. After a couple of minutes he started to realize that I was in passive mode so he jumped into his car and tries to hit me. So I kept jumping back and forth over the concrete wall for a good 5 minutes. I get bored so I decide to climb in the passenger seat of his car. He gets off, I get off, he gets back in the car, I do the same for another 2 minutes. Finally, he drove off (with me in the car), gain some speed, then launch himself out of the car. My character takes the wheel, I slam the brake and started reversing toward him. He started to spray the car with bullets but I managed to ram him (and kill him) before he kills me.
Then, I disabled passive mode, got out of the car, put a sticky bomb on it and hide a bit further, behind a container. He spawned not far away and came back for his car. BOOM, I kill him for the 3rd time!
I was planning to spawn kill him for being so stupid but he left the lobby...I wonder why.