At the world map, enter the Warren's Report option. Hit any button until you see Warren's menu and the timer. Now, using the second controller, quickly press: Up, Right, Down, Left, Y, Up, Left, Down, Right, X, Up, Right, Down, Left, L, Up, Left, Down, Right, R, Up, Down, Up, Down, B, Left, Right, Left, Right, A, Select, Select, Start, Start, A, A, A, A, A, A, A. Then wait until the last digit of the timer (the seconds) shows the number 9 and press the B button on controller 2. If done right, a fifth option will appear in Warren's menu which will let you see your reputation among the countries.