Heh, I just recalled a day long ago when I was messing around with "Driver 2". Well, I was going freeriding through Chicago, and there's these drawbridges, right?
Well, I parked my car exactly in the middle of the drawbridge and waited for it to start lifting up and seperating, and then I jumped out of the car and ran down the side. The car fell through the gap, and I felt quite proud of shamelessly removing my ride from the game. ...or so I thought.
I went walking over to an intersection, looking for my next ride to steal, when all of a sudden the car I was about to jack started sinking into the road. It fell end over end under the ground, and disappeared from view. I was like, "WTF!?"

Soon I noticed that other cars started falling through the ground all around me, and then they'd reappear in the sky and slam into the ground at rather high velocities. It was totally raining cars!

Edit: I was *usually* able to reproduce this glitch, too, but sadly I no longer own the game. If anyone else does, try doing it. Just note where the center of the bridge is and get the car to fall through the gap when it opens. *And be sure not to fall to your death, too*