You MUST check this out.
http://www.cyberniklas.de/pongmechanik/index.html
A German inventor has gone to the trouble of creating a physical, real world version of PONG.
The site graphics are wonderful. Don't be put off by the fact it's in german, the 7 minute video documentary has English subtitles and there's something very soothing about the german narration.
I got this in my capacity as Administrative assistant at the Science Museum. I'm not %100 percent sure this isn't some sort of joke (the site looks like a hoax) but the machine itself looks quite real.