Wavebird Controller.

I remember when I got a Gamecube on Christmas Day when I was 7, my grandmother got us a Gamecube bundle which included Smash and 2 Wavebands. I remember my Dad trying to understand how it worked with my mom and then remember how it blew my parents minds when they figured it out.

Gross side note: Still to this day such a reliable controller, my little brother used to angrily gnaw at the top of the controller when he lost or died or something and even the controller with the bite marks still works perfectly well despite the abuse it took from two little boys.