Digivice Pendulum X DDR
Both released in the late 90s, these toy/games were one of the firsts to introduce the world to interactive game play -
The Digimon Pendulum with the excessive shaking during battles and evolution, and DDR with the really silly and awkward 'dance' movements.
Despite how outdated they are as compared to the high-tech gadgets with the screen tapping and whatnot of today, they revive fond memories of my childhood. I cannot imagine what the world would be like today without rhythm games and movement 'sensors' that were probably influenced by these games.
( Or at least, I choose to think so! :P )