I'd say the best and worst or the most exciting and annoying thing happened to me last Saturday.
Online while flying a Cessna like plane, I followed two players (level 60s and 80s. While I'm on level 19) who had the red outline showing that they were also members of GTPlanet.
They had a wanted level, on foot in the mountains with three helicopters chasing them. I though it'll be cool enough to fly into one of those helicopters but got two! After re-spawning, I got gunned down instantly by a "SuperShouder" or lets say "1", I didn't take it kindly, but unfortunately put down the other guy "2" by accident and then evened the score on "1" afterwards, and scuttered off.
Well, as these things go, no one takes anything kindly, so I end up getting $1000 (at least) bounty from "1". Get stalked and chased by "2". While waiting for him or her behind a wall, "2" threw a grenade and blew him/herself up!
Later on, I got another plane from the airport to wait out and eventually get the bounty money, a while afterwards "2" gets a buzzard or helicopter with missiles. That led to an "emergency landing" on the motorway and a shoot-out with a helicopter. I got shot, but then left while "2" dealt with a wanted level with a failed helicopter. While leaving I get a message that "2" put a $9000 bounty on me.
After fleeing, I'm chased and shot at by another guy "3" in Annihilator while I was in a minivan (Chrysler Voyager). A just got to a gun store where "3" can't shoot in, so he shoves the minivan through the door to try and shoot me from the outside but that didn't help when I hid behind the door. "3" then walks in to buy something like grenades, I walked out, waited and got him. What I didn't know was that "3" had a $7500 bounty!
I fecked over to the neighbouring clothes shop to bank the cash. After a bit, the shop closes and weapons are allowed in. At that time, "2" and I think "1" or someone else comes along and so a shoot out in the clothes shop occurs. I was killed by a grenade from "3". After re-spawning in a terrible place outside, I was over it and tried to leave but they kept shooting.
So the lesson is, don't bother helping others (even if they're on the same crew) since you'll get murdered by them and no one learns how to let go of a grudge!
I'm afraid I actually insulted them as a result! Surely no one should be for that long while playing online!