Use the following commands during the intro movie to get the result indicated.

L3 - Changes opening credits to 4 different languages and into slithering snake bones.
Press R3 - Changes the symbols
Rotate the left analog stick - Credits will make waves as they move across the screen
Press any button of the dpad - little circles come up to the screen
Press RB - Singer whispers "Snake Eater"
Rotate the right analog stick - Symbols appear on screen