Mine's was Parappa teh Rapper.... But that's before I knknew what rhythm games were... THen Jammer Lammy.... then here was a LOOONG break.
Then oneday at a Target, I saw a demo for Amplitude... right around the same time I was getting into digital recording.... ha imagine that....
3 years later... I bought Amplitude and then my friend showed me DDR... (I knew what DDR was but only saw it in arcades)... then it just went on from there....
I knew there was something special about DDR when I saw it in arcades though... I couldn't play it (and still can't ) because of my eye condition... I can only play home versions... ugh... but I would just hang around the machine and watch others play....
This is why I like online games... IIDX should take a hint....