My first console as a kid was the Colecovision, which was the PS3 of its era. Yes, even in 1981 you could be a graphics whore. Anyway, my first game for it was Cosmic Avenger. It was a sidescrolling shoot-em-up. I remember using the left button to drop bombs and being confused as to how to kill the flying enemies...and then I realized the truth: THE OTHER BUTTON FIRES. Seriously, I can't tell you how much it blew my mind that 2 different buttons could do different things at the same time.