Down, down-right, right then punch. It's a series of button presses synonymous with the greatest fighting series ever made, and has found its way into plenty of other wannabes and copycats. This is the button combination for the legendary 'hadoken' fireball, first seen in the original Street Fighter arcade game back in 1987. Of course, we first heard that now infamous word in the 1991 sequel, Street Fighter II, but you would be forgiven for never having played the original. It was a bit pap.