Quoted from jrpinball:That's true in many cases, but it does not automatically ground your two prong plug games. They're not grounded, period. Whether one sees this as being necessarily hazardous or not is what this discussion really centers on.
Of course, you certainly would not tie the white to any metal in a game, this creates nasty ground loops. But there still is a path to ground. If something shorts between the two leads then the breaker will pop. I just moved into a new house, all the circuits are GFI, in effect giving me grounding in my 2 wire games. Any leakage (me lifting the slam switch in bare feet on concrete slab) and the GFI will trip. When I replace a 2wire cord with a 2wire cord I always polarize it...