I'd mentioned Pong but it was actually the gaming console that STARTED the whole mess. My dad bought us the first one that came out... I remember friends coming over and asking how does it work and being a NERD (geeks hadn't evolved yet) that I was, I explain in detail on it... instantly boring my friends to tears.I'm glad that someone else mention pong.
Do you remember the hand held foot ball games that the men were shaped like diamonds, Don't forget Donkey Kong.
I do remember those football games by mattel ... not the diamond shaped men but the little lines that you moved up down and forward or back to avoid the others in your way to a touchdown. At the time t'was pretty nifty little thing for kids/teenagers on long trips or boring classes *ahem*