Once I ran over a motorcyclist to be able to steal his motorcycle. Just as I pressed ENTER to mount the bike, the original owner of the motorcycle decided the same thing, so I ended up in the driver's seat with an old, ugly man sitting behind me, pressing his.. AAIIEEH. I prefer not to think about it. Anyhow, when I finally got off the bike, the guy was still sitting behind me and as I moved away he suddenly drove off, still sitting in the passenger seat, not even touching the steering handles. It looked REALLY odd.
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Yea the same thing has happened to me with the motorcyle before, but also i have had it the other way round too, i had knocked some random woman off a motorbike, got out and just pressed triangle to get on the bike but she got on before me, leaving me in the passenger seat!! (w00t) She just carried on driving for a while before i got bored.
The same thing with the planes happens on playstation. The AI are actually really bad drivers with planes and always seem to fly about 2 meters off ground level on the mountain before crashing, tis fun though jusmping off that mountain on a bike.....can get some serious insane stunt bonuses. :D