In Ratchet and Clank 3 on PS2 (PlayStation 2), if you pause the game and enter: circle, square, circle, square, up, down, left, left the ninja sword will appear, replacing you wrench.
The sword does no extra physical damage but i'm sure it mentally plays on those AIs as they tremble in fear from the awesomeness.
This is a test post to launch a task so I can use kryptonia.