To bump this topic, I'll tell a story of a random I met yesterday.
Basically I was farting around in a full session when I stumbled upon a Cargobob. Figured I'd give it a shot. So I followed some players around, waiting to see what their reactions could be. Some guy was in a 3 star chase, so I rammed the helicopter that was chasing him, then picked up a police car from a roadblock and carried it around as I was following him. Eventually he drove into a tunnel and that was the end of that. I met a few hostile ones who attempted to shoot me too.
And then there I was flying around downtown when I saw one of the players park right beneath me and honk. Seemed as though he WANTED to be picked up, which is what I did. I flew him on top of the tallest building, dropped him off at the helipad and landed the Bob. We swapped, he took the Bob and I took his (personal) car. Must have been a REALLY trustworthy player. I texted him "yolo" and drove off the building. Managed to land intact, although his personal vehicle got a MASSIVE dent on the back.
After that we proceeded to swap places, with one flying the chopper and the other sitting in a car under the Bob, as we dropped one another from great heights in various places. Eventually his car was lost after landing in one of the ponds in the LS golf club, and the Bob got busted after hazardous flying and one too many landing (I swear I can't land that thing without a huge thud no matter how gently I try). Anyway, all this was done with no voice chat or planning whatsoever, just the occasional text message. Needless to say, this random ended up on my friends list and this whole random activity made my day.