If you've watched some of the Big Rigs Racing game, it's more than just the physics engine that's borked. For example at the beginning of the race you can back up over the finish line, drive forward, and win. I can't imagine anyone coming up with a buggier game that was actually sold than that one.

I played Quest For Glory 4 way back when and it crashed all the time. There were certain rooms that every time I entered, the game would just die. This was one of the first games I bought on CD-Rom and I had an early CD-Rom drive as well, and since I've not seen many people complain about it I assume I had either a faulty drive or disc.