The folks at Caterham Japan felt that, no matter how good Gran Turismo 5 is, it still can't beat the real thing. So they took a Seven around GT5's Route 246 road course in Tokyo... in real life. Here's video.
It turns out that in real life there's a lot more traffic.
And yes, in real life, the Tokyo "Route 246" track starts off and ends right next to Sony's worldwide headquarters.