This glitch requires handling the game system. This could potentially hurt your game.
Start up the game and as soon as the "Super Mario 64" logo appears, push and hold the reset button on the Nintendo 64. Wait a few seconds and Mario will say "Its'a me, Mario!" You can also wait until he starts saying it, and then push reset halfway through. He will continue to say it for a few seconds after you push and hold reset.
Submitted by: Mitchell VanRassel