Super Fun "Glitch": Play As Two Characters at Once! (Tutorial and Many Images Included!)

I'd report this as a bug if it weren't so game-changing and fun, but as the title suggests, you can play as two characters at once!

What is this exactly?
This "glitch" enables a player to act as both Player 1 and Player two with one Gamecube controller.

What you need.
At least two Gamecube controllers.
Project M (obviously)

How to do this...

Super Fun "Glitch": Play As Two Characters at Once! (Tutorial and Many Images Included!)